22. Appendices¶
22.1. Units of Measure¶
Open Rails supports the same default units of measure as MSTS which are mostly, but not exclusively, metric.
When creating models just for Open Rails, we recommend you do not use defaults but specify units for all values that represent physical quantities.
As shown below, Open Rails provides a wider choice of units than MSTS.
Measure | Default unit | Applies to | OR accepts | MSTS accepts | Comment |
---|---|---|---|---|---|
Mass | kg | kg | kg | ||
t | t | metric tonne (1000 kg) | |||
lb | lb | ||||
t-uk | Imperial ton (2240 lb) | ||||
t-us | US ton (2000 lb) | ||||
Distance | mm | ||||
cm | cm | ||||
m | m | m | |||
km | |||||
in | in | ||||
in/2 | in/2 | half-inch – historic unit for tyre diameters | |||
ft | |||||
mile | |||||
Area | m^2 | ||||
*(m^2) | *(m^2) | ||||
ft^2 | ft^2 | ||||
*(ft^2) | *(ft^2) | ||||
Volume | l | diesel fuel | l | liter | |
m^3 | |||||
*(m^3) | |||||
in^3 | |||||
*(in^3) | |||||
ft^3 | other | *(ft^3) | *(ft^3) | e.g. BoilerVolume | |
g-uk | Imperial gallons | ||||
g-us | US gallons | ||||
gal | US gallons | ||||
gals | gals | US gallons | |||
Time | s | s | |||
m | |||||
h | |||||
Current | amp | amp | |||
A | |||||
Voltage | volt | V | |||
kV | |||||
Mass Flow | g/h | ||||
kg/h | |||||
lb/h | lb/h | lb/h | |||
Speed | m/s | other | m/s | m/s | meter per second |
km/h | |||||
kph | kph | kilometer per hour | |||
kmh | kmh | misspelling accepted by MSTS | |||
kmph | |||||
mph | dynamic brake | mph | mph | miles per hour | |
Frequency | Hz | Hz | Hertz | ||
rps | revolutions per second | ||||
rpm | |||||
Force | N | N | N | Newton | |
kN | kN | ||||
lbf | Pounds force | ||||
lb | |||||
Power | W | W | Watt | ||
kW | |||||
hp | horsepower | ||||
Stiffness | N/m | N/m | N/m | Newton per meter | |
Resistance | N/m/s | N/m/s | N/m/s | Newton per meter per second | |
Ns/m | Newton seconds per meter | ||||
Angular Resistance | N/rad/s | N/rad/s | |||
Pressure | psi | air pressure | psi | pounds per square inch | |
bar | atmospheres | ||||
kPa | KiloPascal | ||||
inHg | vacuum | inHg | inches of mercury | ||
Pressure Rate of Change | psi/s | psi/s | |||
bar/s | |||||
kpa/s | |||||
inHg/s | |||||
Energy Density | kJ/kg | kJ/kg | kiloJoule per kilogram | ||
J/g | |||||
btu/lb | Board of Trade Units per pound | ||||
Temperature Difference | degC | degC | |||
degF | |||||
Angle | radians | – | |||
deg | |||||
Angular Speed | rad/s | – | rad/s | ||
Other | – | lb/hp/h | e.g. CoalBurnage |