10. Cruise Control

10.1. General

With Cruise Control the train driver sets a speed, that is then reached and maintained by the train.

To equip an electric or diesel locomotive with CC, following steps must be performed:

  1. In the .eng file the required entries must be provided

  2. in the .cvf file the required cab controls must be added

  3. in the .sms files the required sound stream entries must be added.

To drive a locomotive that has been equipped with CC following driver interfaces are available:

  1. Keyboard commands

  2. Mouse

  3. HUD and Train Driving window.

The CC feature includes also the management of a very versatile specific controller, called Multi Position Controller (MPC).

A paragraph is devoted to each of the above topics.

10.2. Operation Modes

The CC Speed Regulator can be in 4 different states (or modes), that is:

  1. Manual, when the automatic cruise control is disabled and the driver controls the speed through throttle and brakes as if there were no CC.

  2. Auto, when the automatic cruise control is enabled, and therefore the speed is automatically controlled

  3. Testing, not implemented at the moment

  4. AVV, not implemented at the moment.

Switching between Manual and Auto mode can be configured to occur either by a specific cabview control (ORTS_SELECTED_SPEED_REGULATOR_MODE) or when certain conditions, defined in the .eng file parameters, are met, or by keyboard commands. One of such parameters is e.g. ForceRegulatorAutoWhenNonZeroSpeedSelected.

The CC Speed Selector can be in 4 different states (or modes), that is:

  1. Parking

  2. Neutral

  3. On

  4. Start.

Switching betwenn Speed Selector Modes can be configured to occur either by a specific cabview control (ORTS_SELECTED_SPEED_MODE) or through keyboard commands.

The Cruise Controller can be of three types:

  1. None

  2. Full

  3. SpeedOnly

The type selection occurs through .eng parameter ControllerCruiseControlLogic. Types None and Full work the same way. None is default, meaning the full Cruise Controller features are active.

10.3. Parametrizing the .eng file

In the Engine section of the .eng file the CC parameters must be declared within an ORTSCruiseControl block, this way:

ORTSCruiseControl(
  CCparameter1 (value)
  CCparameter2 (value)
  ...
  CCparametern (value)
  Options ("Option1", "Option2", ... "Optionn")
  ForceStepsThrottleTable ("IntValue1", "IntValue2",...,"IntValuen")
  AccelerationTable ("FloatValue1", "FloatValue2",...,"FloatValuen")
)

A list of the available .eng file CC parameters follows here below.

.eng parameters

Parameter

Description

Units

Default

SpeedIsMpH

KpH if missing

Boolean

FALSE

MaxForceSteps

Usually will be 100 meaning 100%, but some locos have limited force steps

Integer

0

SpeedSelectorStepTimeSeconds

How fast the selected speed lever adds speed

Float

0.1

DynamicBrakeMaxForceAtSelectorStep

The brake will reach 100% at this step, the lower the step, the lower the max brake percent

Integer

1

NominalSpeedStep

When pressing Shift+A or Shift+D how many speed units should the selected speed change

Integer

0

StartReducingSpeedDelta

The lower number, the sooner the regulator will decrease power

Float

1

StartReducingSpeedDeltaDownwards

If present and different from zero, overrides the above parameter for dynamic braking

Float

0

ForceRegulatorAutoWhenNonZeroSpeedSelected

When a non zero speed is selected, the regulator is set to auto

Boolean

FALSE

ForceRegulatorAutoWhenNonZeroSpeedSelectedAndThrottleAtZero

Self explaining

Boolean

FALSE

MaxForceKeepSelectedStepWhenManualModeSet

Self explaining

Boolean

FALSE

ForceResetRequiredAfterBraking

After manual braking, to apply again force, the force must first be manually reset to zero

Boolean

FALSE

DynamicBrakeIsSelectedForceDependant

If true dynamic brake force applied depends from the position of the force selector, else always the maximum dynamic brake force is applied

Boolean

FALSE

ThrottleFullRangeIncreaseTimeSeconds

Time in seconds needed for the regulator to pass from 0 to 100% of power

Seconds

5

ThrottleFullRangeDecreaseTimeSeconds

Time in seconds needed for the regulator to pass from 100 to 0% of power

Seconds

5

DynamicBrakeFullRangeIncreaseTimeSeconds

Same as above, but for dynamic braking

Seconds

5

DynamicBrakeFullRangeDecreaseTimeSeconds

Same as above, but for dynamic braking

Seconds

5

TrainBrakeFullRangeIncreaseTimeSeconds

Same as above, but for train brakes

Seconds

10

TrainBrakeFullRangeDecreaseTimeSeconds

Same as above, but for train brakes

Seconds

5

DefaultForceStep

When OR is started, this will be the selected force step, usually set at 0

Integer

1

DisableCruiseControlOnThrottleAndZeroSpeed

If train is stationary and throttle is increased and CC is still in auto, this will revert the mode to manual

Boolean

FALSE

DisableCruiseControlOnThrottleAndZeroForce

If train is moving and throttle is increased and CC is still in auto and selected force is zero, this will revert the mode to manual

Boolean

FALSE

DynamicBrakeCommandHasPriorityOverCruiseControl

When cruise control is in Auto, manually activating the dynamic brake has priority

Boolean

TRUE

HasIndependentThrottleDynamicBrakeLever

The cabview is equipped with a combined Throttle-Dynamic brake lever independent from the CC controls

Boolean

FALSE

DoComputeNumberOfAxles

Number of train axles automatically computed at game start

Boolean

FALSE

AntiWheelSpinEquipped

Self explaining. Note: if there are multiple locos in the consist, the loco with most speed diff takes the decision to activate

Boolean

FALSE

AntiWheelSpinSpeedDiffThreshold

The speed difference (MpS) between wheel speed and train speed that activates the anti spin system and reduces power

Boolean

FALSE

ParkingBrakeEngageSpeed

The speed when automatic parking brake will be engaged if present

Float (speed)

0

ParkingBrakePercent

To what engine brake percent should the parking brake be set if engaged

Float

0

MaxPowerThreshold

At this speed, no matter what max force was selected by the driver, the regulator will lineary reach force to 100%

Float (speed)

0

SafeSpeedForAutomaticOperationMpS

Some locos/systems need the ‘confirm to drive’ button to be held until the safe speed is reached. This is the speed above which the loco will continue delivering power.

Float (speed)

0

ContinuousSpeedIncreasing

Logical

FALSE

PowerBreakoutAmpers

Some locos are unable to maintain power when current is lower than this value. In that case, a breakout is generated and the power goes to 0

Float(Amperes)

100

PowerBreakoutSpeedDelta

Obsolete

Float

100

PowerResumeSpeedDelta

When breakout was activated, this is the speed hysteresis, when speed is reduced by this value the engine will resume power

Float

100

PowerReductionDelayPaxTrain

Time required for the loco to reach maximum percent of power set in PowerReductionValue until the whole train is in pull on its couplers for passenger trains

Float (seconds)

0

PowerReductionDelayCargoTrain

Time required for the loco to reach maximum percent of power set in PowerReductionValue until the whole train is in pull on its couplers for freight trains

Float (seconds)

0

PowerReductionValue

Maximum power in % to maintain until PowerReductionDelay is reached

Float

100

DisableZeroForceStep

Minimum force step is limited above zero

Boolean

FALSE

UseThrottleAsSpeedSelector

if ControllerCruiseControlLogic is set to SpeedOnly, throttle when in Auto mode will change the maximum CC speed

Boolean

FALSE

UseThrottleAsForceSelector

if ControllerCruiseControlLogic is set to None, throttle when in Auto mode will change the maximum CC Force

Boolean

FALSE

UseThrottleInCombinedControl

Throttle is used as force selector or speed selector even if in combined control, to be used in conjunction of one of the two above parameters

Boolean

FALSE

ControllerCruiseControlLogic

Can have values ‘None’, ‘SpeedOnly’, ‘Full’

Enum

Full

HasProportionalSpeedSelector

Speed selector is performed by a lever ranging from 0 to max speed

Boolean

FALSE

SpeedSelectorIsDiscrete

Speed selected can have only values multiple of NominalSpeedStep, even if selection is through mouse

Boolean

FALSE

ModeSwitchAllowedWithThrottleNotAtZero

Switch from manual to auto and vice-versa can occur also when throttle lever is not at 0

Boolean

FALSE

DisableManualSwitchToAutoWhenSetSpeedNotAtTop

Manual Switch to Cruise Control Auto Mode can’t occur when speed is not set at maximum value and at the same moment train speed is not 0

Boolean

FALSE

UseTrainBrakeAndDynBrake

CC uses train brake and dyn brake together

Boolean

FALSE

UseDynBrake

CC uses dyn brake

Boolean

TRUE

TrainBrakeCommandHasPriorityOverCruiseControl

A manual train braking inhibits Cruise Control to use both dynamic braking and tractive force

Boolean

TRUE

TrainBrakeCommandHasPriorityOverAcceleratingCruiseControl

A manual train braking inhibits Cruise Control to use tractive force

Boolean

TRUE

SpeedDeltaToEnableTrainBrake

This is the minimum speed delta between actual speed and desired speed for the CC to use also the train brake

Float(speed)

5m/s

SpeedDeltaToEnableFullTrainBrake

This is the minimum speed delta between actual speed and desired speed for the CC to use also the train brake with no reduced intensity

Float(speed)

10m/s

TrainBrakeMinPercentValue

This is the minimum train brake percent used by the CC. 0 means no braking, 100 means full service braking

Float(percent)

30

TrainBrakeMaxPercentValue

As above for maximum value. It must not be too high to avoid that the brake is not fully released timely

Float(percent)

85

ThrottleNeutralPosition

The zero throttle position is neutral in auto mode, that is in such position the CC does not intervene

Boolean

FALSE

MinimumSpeedForCCEffect

Below this speed CC has no effect

Float(speed)

0

StartInAutoMode

Game starts with CC in Auto mode

Boolean

FALSE

KeepSelectedSpeedWhenManualModeSet

When switching from auto to manual and back to auto using keyboard or cabview control, the previously selected speed is kept,if false the train speed when passing to manual to auto is used as selected speed

Boolean

FALSE

The list of the available parameters for the Options() block may be found in the table here below.

Options

Name

Description

RegulatorAuto

RegulatorManual

RegulatorTest

EngageForceOnNonZeroSpeed

StartFromZero

No need to confirm you want to drive. If speed is set above zero, the train starts to move

SelectorNeutral

SelectorOn

SelectorStart

SelectorParking

The presence of ForceStepsThrottleTable and AccelerationTable is optional.

Braking by CC can occur either using only the dynamic brake (default) or using only the train brake, when the locomotive has no dynamic brake, or using both the dynamic brake and the train brake. For this to occur parameter UseTrainBrakeAndDynBrake must be set to true in the CruiseControl block within the .eng file.

Train brake usage occurs when the delta between the actual train speed and the target speed is higher than parameter SpeedDeltaToEnableTrainBrake. Between this delta and SpeedDeltaToEnableFullTrainBrake the train brake is set at TrainBrakeMinPercentValue. Above SpeedDeltaToEnableFullTrainBrake the train brake is continuously adjusted to achieve a constant deceleration. In other words, when the speed delta is high, train braking is adjusted to obtain a constant deceleration when dynamic braking is not enough; when train decelerates and delta reduces to SpeedDeltaToEnableFullTrainBrake the train brake is reduced to TrainBrakeMinPercentValue. When train decelerates further and delta reduces to SpeedDeltaToEnableTrainBrake the train brake is released. By adjusting these parameters to the locomotive and a typical train it pulls, it can be made sure that the brake pipe is fully recharged when the target speed is reached. Else the train speed could be significantly reduced below the target speed.

An example of the relevant lines in the CruiseControl block within the .eng file follows here:

UseTrainBrakeAndDynBrake ( True ) comment (** CC uses train brake and dyn brake together **)
        SpeedDeltaToEnableTrainBrake ( 15km/h ) comment (** This is the minimum speed delta between actual speed and desired speed for the CC to use also the train brake **)
        SpeedDeltaToEnableFullTrainBrake ( 30km/h ) comment (** This is the minimum speed delta between actual speed and desired speed for the CC to use also the train brake with no reduced intensity **)
        TrainBrakeMinPercentValue ( 10 ) comment (** This is the minimum train brake percent used by the CC, where 0 means no braking and 100 full braking **)
        TrainBrakeMaxPercentValue ( 60 ) comment (** As above for maximum value. It must not be too high to avoid that the brake is not fully released timely **)

10.3.1. Multi Position Controller (MPC)

It is possible to manage a CC also without a MPC, in case the throttle controller is used for CC, or a proportional speed selector is available. In the other cases in general a MPC is needed.

The Multi Position Controller(s) (more than one can be defined) is defined in the .eng file too with an ORTSMultiPositionController block, this way:

ORTSMultiPositionController (
  Positions (
    Position ( PositionType1 PositionFlag1 "PositionName1" )
    Position ( PositionType2 PositionFlag2 "PositionName2" )
    ...
    Position ( PositionTypen PositionFlagn "PositionNamen" )
  )
  ControllerID ( ID )
  ControllerBinding ( "Controller Linked" )
  CanControlTrainBrake ( Boolean )
)

The list of the available PositionTypes may be found in the table here below.

MPC Position Types

Position type

Description

Neutral

Drive

If MPC is throttle type, it will drive on selected force. If its bound to CC, will drive until speed was reached

ThrottleIncrease

Will increase throttle or speed of CC

ThrottleDecrease

ThrottleIncreaseFast

Will increase throttle or speed of CC twice faster

ThrottleDecreaseFast

DynamicBrakeIncrease

DynamicBrakeDecrease

DynamicBrakeIncreaseFast

TrainBrakeIncrease

TrainBrakeDecrease

EmergencyBrake

ThrottleHold

DynamicBrakeHold

ThrottleIncreaseOrDynamicBrakeDecreaseFast

This is for e.g. CP handle, will increase throttle or decrease dyn brake

ThrottleIncreaseOrDynamicBrakeDecrease

DynamicBrakeIncreaseOrThrottleDecreaseFast

DynamicBrakeIncreaseOrThrottleDecrease

KeepCurrent

Will keep throttle or dynanmic brake

SelectedSpeedIncrease

SelectedSpeedDecrease

SelectSpeedZero

The list of the available PositionFlags may be found in rhe table here below.

MPC Position Flags

Position flag

Description

SpringLoadedForwards

if moved aft, will wait 300 miliseconds, the return to previous position forwards

SpringLoadedBackwards

same but backwards

SpringLoadedForwardsImmediately

if moved aft, will return to previous position forwards immediately

SpringLoadedBackwardsImmediately

same but backwards

Default

The position set when game is loaded

PositionNames are arbitrary strings.

The ControllerID is an integer, which must be unique for every defined MPC.

The ControllerBinding parameter defines to which function the MPC is connected. Controllers linked may be either “Throttle” or “SelectedSpeed”.

The boolean parameter CanControlTrainBrake, which is false by default, is optional.

10.4. Cruise Control Cabview Controls

The list of the available cabview controls may be found in the table here below. Please note that spaces within cabview control names are there only for table display purposes, and must not be entered in the .cvf files.

Cabview Controls

Control Name

Description

UoM

Mouse activated

ORTS_SELECTED_SPEED

Used to display the selected speed, e.g. as a digital value

km/h or MpH

ORTS_SELECTED_SPEED_DISPLAY

As above, but displays the speed in km/h divided by 10

km/h

ORTS_SELECTED_SPEED_MODE

Displays and/or changes the Speed Selector Mode

Y

ORTS_SELECTED_SPEED_REGULATOR_MODE

Displays and/or changes the Speed Regulator Mode. Control can be used as ON/OFF (if only Manual and Auto mode are available) or as MULTISTATE (in case of more than two modes)

Y

ORTS_SELECTED_SPEED_MAXIMUM_ACCELERATION

Displays and/or changes the maximum acceleration(force) applied by the CC; MaxValue in Range line must be equal to number of frames of the .ace file

Y

ORTS_RESTRICTED_SPEED_ZONE_ACTIVE

Used to display and to set the restricted speed zone flag. See paragraph ‘Restricted Speed Zone’ in manual.

Y

ORTS_NUMBER_OF_AXES_DISPLAY_UNITS

This display control is usually used together with the following two. Together they display the number of axles of the train, as set by the driver or automatically by OR.

ORTS_NUMBER_OF_AXES_DISPLAY_TENS

See above

ORTS_NUMBER_OF_AXES_DISPLAY_HUNDREDS

See above

ORTS_TRAIN_LENGTH_METERS

Displays the train length

meters

ORTS_REMAINING_TRAIN_LENGTH_SPEED _RESTRICTED

When the restricted speed zone flag is activated, displays the remaining train lenght that hasn’t yet arrived at the end of the restricted speed zone. Else shows 0

meters

ORTS_REMAINING_TRAIN_LENGTH_PERCENT

When the restricted speed zone flag is activated, displays the remaining train lenght percent that hasn’t yet arrived at the end of the restricted speed zone. Else shows 0

ORTS_ACCELERATION_IN_TIME

Value of AccelerationBits; some cabs can show ‘Arrows’ pointing up or down according to speed change
Cabview Controls (continued)

Control Name

Description

UoM

Mouse activated

ORTS_ODOMETER

Displays the odometer value since last odometer reset

meters or Km

ORTS_FORCE_IN_PERCENT_THROTTLE_AN D_DYNAMIC_BRAKE

Displays the actual throttle percent or the negated dynamic brake percent when in manual mode; displays the actual CC force percent or the negated dynamic brake percent when in auto mode

ORTS_MAXIMUM_FORCE

Displays the preset maximum force of the locomotive

Newton

ORTS_MOTIVE_FORCE

Displays the actual motive force of the locomotive

Newton

ORTS_MOTIVE_FORCE_KILONEWTON

Displays the actual tractive or electric braking force of the locomotive

KN

ORTS_TRAIN_TYPE_PAX_OR_CARGO

Displays whether the selected tran type is passenger or freight. Can be toggled with a keyboard command

ORTS_CONTROLLER_VOLTAGE

Displays the controller volts as set by the CC (may vary from 0 to 100).. Controller volts control the motive force of the locomotive

ORTS_AMPERS_BY_CONTROLLER_VOLTAGE

Displays the current used for the motive force of the locomotive

Amperes

ORTS_CC_SELECTED_SPEED

Sets speed to value of ORTSParameter1 (KpH or MpH depending from eng parameter SpeedIsMpH)

Y

ORTS_NUMBER_OF_AXES_INCREASE

Increases the number of axles of the train, when mouse pressed

Y

ORTS_NUMBER_OF_AXES_DECREASE

Decreases the number of axles of the train, when mouse pressed

Y

ORTS_MULTI_POSITION_CONTROLLER

Displays and sets the position of the MPC

Y

ORTS_CC_SPEED_0

Displays and sets the selected speed at 0

Y

ORTS_CC_SPEED_DELTA

Increases or decreases the selected speed by the value of ORTSParameter1 (KpH or MpH depending from eng parameter SpeedIsMpH)

Y

ORTS_SELECTED_SPEED_SELECTOR

Speed selection done by independent lever ranging from 0 to max speed; UoM may be KpH or MpH.

Y

10.4.1. Restricted Speed Zone

Strictly this is not a Cruise Control function. When the driver sets the cabview control ORTS_RESTRICTED_SPEED_ZONE_ACTIVE, the Cruise Control sets to true and displays a boolean variable. This boolean variable remains true until the full length of the train has passed the point where the driver set the cabview control. When the variable returns false, also a sound trigger is activated.

This feature helps the train driver to identify when the full length of the train has passed a restricted speed zone, so that he can again increase speed of the train.

10.5. Cruise Control Sound Triggers

The list of the available sound triggers may be found in the table here below.

Sound Triggers

Trigger #

Trigger name

Description

298

LeverFromZero

Triggered when ORTS_SELECTED_SPEED_MAXIMUM_ACCELERATION and ORTS_SELECTED_SPEED_SELECTOR are moved from zero position

299

LeverToZero

Triggered when ORTS_SELECTED_SPEED_MAXIMUM_ACCELERATION and ORTS_SELECTED_SPEED_SELECTOR are moved to zero position

300

CruiseControlSpeedRegulator

Triggered when the Speed Regulator changes mode

301

CruiseControlSpeedSelector

Triggered when the Speed Selector changes mode

302

CruiseControlMaxForce

Triggered when the Max force selector lever is moved

303

CruiseControlAlert

Triggered when the tail of the train has passed a restricted zone, if the restricted zone control had been activated

304

CruiseControlAlert1

Triggered when a new speed has been set

310

MPCChangePosition

Triggered when a MPC changes position

10.6. Cruise Control Keyboard commands

The list of the available keyboard commands may be found in the table here below.

Keyboard commands

Command name”

Keystroke

Description

ControlSpeedRegulatorModeIncrease

Shift+W

Changes the speed regulator mode in ascending sequence

ControlSpeedRegulatorModeDecrease

Shift+S

Changes the speed regulator mode in descending sequence

ControlSpeedRegulatorMaxAccelerationIncrease

Ctrl+Shift+D

Increases the max acceleration (max force) allowed for the CC

ControlSpeedRegulatorMaxAccelerationDecrease

Ctrl+Shift+A

Decreases the max acceleration (max force) allowed for the CC

ControlSpeedRegulatorSelectedSpeedIncrease

Shift+D

Increases the selected speed

ControlSpeedRegulatorSelectedSpeedDecrease

Shift+A

Decreases the selected speed

ControlNumberOfAxlesIncrease

Ctrl+Shift+7(NumKey)

Increases the number of axles

ControlNumberOfAxlesDecrease

Ctrl+Shift+1(NumKey)

Decreases the number of axles

ControlRestrictedSpeedZoneActive

Ctrl+Shift+R

Starts checking when tail of train has passed restricted speed zone

ControlCruiseControlModeDecrease

Ctrl+Shift+S

Changes the speed selector mode in descending sequence

ControlCruiseControlModeIncrease

Ctrl+Shift+W

Changes the speed selector mode in ascending sequence

ControlTrainTypePaxCargo

Ctrl+Shift+N

Toggles between setting train as passenger or freight

ControlSpeedRegulatorSelectedSpeedToZero

Alt+Shift+A

Sets selected speed at 0

Keys listed in the table are valid for English keyboard.

10.7. Cruise Control commands through Mouse

The Cabview Controls that may be activated by mouse are flagged with a Y in this table.

10.8. HUD and Train Driving window info about CC

Following info is displayed both in the main HUD and in the Train Driving window:

  1. Speed regulator mode (Manual or Auto). If the mode is Auto, the following further info is displayed:

  2. Target speed (speed set)

  3. Max Acceleration in percentage

Here below a picture of the HUD with CC info is shown

_images/cruisecontrol-mainhud.png

Here a picture of the Train Driving window with CC info is shown:

_images/cruisecontrol-traindriverwindow.png

10.9. Sample files of a CC equipped electric locomotive

The E464 is the Italian electric locomotive that has been built in the highest number of exemplars.

Here below is a picture of the E464 cabview:

_images/cruisecontrol-samplecab.png

Following relevant items are circled in the picture:

  1. Manual throttle-dynamic brake combined control lever (CP_HANDLE COMBINED_CONTROL in cvf file)

  2. CC maximum acceleration lever (ORTS_SELECTED_SPEED_MAXIMUM_ACCELERATION LEVER in cvf file)

  3. Multi position controller lever used to set the target speed (ORTS_MULTI_POSITION_CONTROLLER TWO_STATE in cvf file); it has four positions: unstable target speed increase position, stable neutral position, unstable target speed decrease position, and unstable target speed to zero position

  4. Target speed digital display (ORTS_SELECTED_SPEED DIGITAL in cvf file)

Switching from manual to auto mode and vice-versa occurs only when levers 1 and 2 are in the zero position and lever 3 is in the neutral position. If at that point lever 1 is moved, CC switches to (or remains in) manual mode. If at that point lever 2 is moved, CC switches to (or remains in) auto mode.

The cvf file for the E464 equipped with CC (and also with customized TCS) can be found in the Open Rails folder in DocumentationSampleFilesManuale464_V2SCMT_SCMTscript_alias_CC.zip.

The eng file for the E464 can be found in the Open Rails folder in DocumentationSampleFilesManualFs-E464-390.zip.

10.10. Sample files of a CC equipped locomotive with proportional speed selector

The E652 is one of the first Italian electric locomotives which was equipped with power electronics. Differently from the E464, the preset speed is not set by a multiposition controller, but by a proportional lever, situated at the right of the cabview. “Proportional” means that at every position of the lever a different preset speed corresponds. Zero speed is set when the lever is at the “lowest” position, and the maximum speed is set when the lever is at the “highest” position. The lever is named “ORTS_SELECTED_SPEED_SELECTOR” in the cvf file.

The cvf file for the E652 equipped with CC (and also with customized TCS) can be found in in the Open Rails folder in DocumentationSampleFilesManual652_CC.zip.

The eng file for the E652 can be found in the Open Rails folder in DocumentationSampleFilesManual652_CC.zip.