Train Wagon Scale

Change the capacity of train wagons in a balanced way, to allow for longer or shorter trains.

Motivation

Aesthetically, I like long trains with a single engine. With this mod, wagons can be made lighter so that more can be pulled with a single engine. To maintain balance, the capacity of the wagons is scaled too. Thus, with a scaling factor of 0.5 (the default setting), a 1-8 train will carry the same load as a 1-4 train in vanilla and have similar performance.