Is there anyway to just set Tractive Effort (rather then a Coefficient?)
m4nfo allows to set tractive effort in kN/kp/lbf directly:
definevehicle(_BR75, "BR 75 (ex wü. T5)",
lifecycle(1-1-1912, 1932, 1963)
price(68'750 RM) // DM == RM
Weight of the vehicle can change during gameplay (for example, an engine with cargo capacity, or a bus), this changes the calculated TE value.
If you're working on setting real-life TE values I wouldn't worry about being super accurate:
- TE figures are often 'nominal', i.e. calculated based on weight on the drivers, rather than measured on a train
- actual measured TE varied between different engines of the same class
- actual TE varies as the engine uses up fuel, water etc
- actual TE varies with rail conditions
- lots of the figures come from Wikipedia, [...]
For locomotives, tractive effort is as well defined as is power. Even for MUs (where tractive effort isn´t really meaningful, but acceleration is the most important figure), it would be meaningful, since additional weight by load (passengers) would be negligible.
You have a point here, insofar that actual TE varies (heavily) with rail condition. But given the fact, that there´s always dry and sunny weather in TTD, this is irrelevant.