Open Rails Units of Measure
Aim - this section describes the standard units of measure (UoM) available in Open Rails Train Simulator. These are the UoM used to input values from the
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Note:
- The default UoM shown in the "Default" column is the UoM value that OR assumes if no UoM value is included in the parameter statement. (However it is always good practice to include the relevant UoM)
- The "Alternative UoMs" column shows alternate UoM currently supported by OR.
- The UoM should directly follow the numerical value in the parameter with any spacing, otherwise it will not be correctly interpreted.
| Unit of Measure | Description | Default UoM | Alternative UoMs | Typical Examples |
|---|---|---|---|---|
| Mass | Describes the weight of an object | kg | lb, t (metric tonne), t-uk (imperial ton), t-us (us ton) | Mass ( 106t-us ) |
| Distance | Describes the length or distance between two points or locations. | m | cm, mm, km, ft, in | WheelRadius ( 21.5in ) |
| Area | Describes the area of an object. | m^2 | ft^2 | ORTSSuperheatArea ( 295ft^2 ) |
| Volume (of a space) | Describes the volume of an object. | m^3 | ft^3, in^3 | BoilerVolume ( 340ft^3 ) |
| Volume (fluid quantity) | Describes the fluid quantity contained by an object. | l | g-uk (gallons - uk), g-us (gals - us) | MaxDieselLevel ( 800g-uk ) |
| Time | Describes the elapsed time between two events. | s | m, h | |
| Current | Describes the current flow in a circuit. | A | MaxCurrent ( 2700A ) | |
| Voltage | Describes the voltage of a circuit. | V | kV | |
| Speed | Describes the speed of an object. | m/s | mph, km/h | Sanding ( 20mph ) |
| Mass Rate of Change | Describes the rate of change in mass for an object. | lb/h | kg/h | |
| Frequency | Describes the frequency of movement of an object. | hz | rpm, rps | |
| Force | Describes the force applied to an object. | N | kN, lbf | MaxForce ( 227kN ) |
| Power | Describes the power of an object. | W | kW, hp | MaxPower ( 2650hp ) |
| Pressure | Describes the pressure of an object. | psi | bar, kpa, inhg | MaxBoilerPressure ( 250psi ) |
| Pressure rate of change | Describes the rate of change in pressure of an object. | psi/s | bar/s, kpa/s, inhg/s | TrainPipeLeakRate ( 0.01inhg/s ) |
| Energy Density | Describes the energy density of an object. | kj/kg | btu/lb | ORTSFuelCalorific ( 13700btu/lb ) |
| Temperature | Describes the temperature of an object. | degc | degf | |
| Davis B Coefficient | Describes the UoM for the Davis B value. | ns/m | lbf/mph | |
| Davis C Coefficient | Describes the UoM for the Davis C value. | Nm/s^2 | lbf/mph^2 | |
| Stiffness | Describes the stiffness. | n/m | Stiffness ( 1e6N/m 2e6N/m ) | |
| Rotational Inertia | Describes the inertia due to the rotation of an object. | kgm^2 | ||
| Angle | Describes the angle of an object. | rad | deg | ORTSMaximumWheelFlangeAngle ( 75deg ) |