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The resistance forces specified in the Trainz documentation (I'm talking both the technical manual last issued in TRS04 maybe and the Trainzwiki enhanced docs linked to above) are based on US engineering units. I verified long ago that this is true within the accuracy of measurements taken in the game. In my own work on resistance forces in Trainz I've always used the following units which have been (and still are) used by US railway engineers for resistance calculations:Pound-force as force unit
The technical or gravitational FPS system, is a coherent variant of the FPS system that is most common among engineers in the United States. It takes the pound-force as a fundamental unit of force instead of the pound as a fundamental unit of mass.
In this sub-system, the unit of mass is a derived unit known as the slug.
1 slug = 1 lbF ⋅ 1 s^2/ft
In the context of the gravitational FPS system, the pound-force (lbF) is almost universally simply referred to as the pound (lb).
This will ensure that a default value other than 0 is not used. The only remaining resistance will be a constant force (at least nearly so at moderate to high speeds) of say 1.3 lbf per ton (2000 lbf) of total weight of the railcar(s). Prior to TC1 I think it was nearly a constant force with just a moderate increase at starting from a standing start - like I'd expect to see with roller bearings used universally since the late steam era. However sometime around TC1-TC3 the force is much larger at low speed and decreases as speed increase to something approximating the value specified. It now seems to behave like the old journal bearings used in the early - mid steam era.motor
{
resistance 0
maxvoltage 0
maxspeed 30
max-accel 10000
max-decel 10000
axle-count 0
surface-area 0
moving-friction-coefficient 0
air-drag-coefficient 0
}