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.
p{1cm}p{1.3cm}p{3.5cm}|
| Measure | Default unit | Applies to | OR accepts | MSTS accepts | Comment |
|---|---|---|---|---|---|
| Mass Distance Area Volume | kg m ft^2 l |
*(ft^2) diesel fuel |
kg t lb t-uk t-us mm cm m km in in/2 ft mile m^2 *(m^2) ft^2 *(ft^2) l m^3 *(m^3) in^3 *(in^3) |
kg t lb cm m in in/2 *(m^2) |
metric tonne (1000 kg) Imperial ton (2240 lb) US ton (2000 lb) half-inch -- historic unit for tyre diameters liter |
| Time Current Voltage Mass Flow | ft^3 s amp volt lb/h |
other |
*(ft^3) g-uk g-us gal gals s m h amp A V kV g/h kg/h lb/h |
*(ft^3) gals lb/h |
e.g. BoilerVolume Imperial gallons US gallons US gallons US gallons |
| Speed | m/s |
other kmph |
m/s km/h kph kmh |
m/s kph kmh |
meter per second kilometer per hour misspelling accepted by MSTS |
Frequency Force Power Stiffness Resistance Angular Resistance Pressure Pressure Rate of Change Energy Density Temperature Difference Angle Angular Speed Other |
mph Hz N W N/m N/m/s N/rad/s psi inHg psi/s kJ/kg degC radians rad/s |
dynamic brake air pressure vacuum |
mph Hz rps rpm N kN lbf lb W kW hp N/m N/m/s Ns/m N/rad/s psi bar kPa inHg psi/s bar/s kpa/s inHg/s kJ/kg J/g btu/lb degC degF --deg ---- |
mph N kN N/m N/m/s rad/s lb/hp/h |
miles per hour Hertz revolutions per second Newton Pounds force Watt horsepower Newton per meter Newton per meter per second Newton seconds per meter pounds per square inch atmospheres KiloPascal inches of mercury kiloJoule per kilogram Board of Trade Units per pound e.g. CoalBurnage |