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Altered Train Physics

Originally 'Additional Weight'

- Adds several invisible waggons that carry nothing in order to add or remove weight to the train.
Increasing train weight is a way to have more realistic acceleration, specially when using powerful engine on short and light consists that by default starts up like a rocket.
Values are 50, 100, 200, 500 and 1000 tons in positive and negative declinations;
Compose multiple to reach target weight.
Note that when the total train mass is negative, the train just stops and don't move anymore since the game does not handle quantum physics.

- Adds invisible engines to add or remove power.
Values are 10, 50, 100, 200, 500, 1000 kW, in positive and negative declinations and in both ELECTRIC and DIESEL for consistency:
All powers sum.
With any positive DIESEL power, an electric train can run along unelectrified tracks with all the power.
Compose multiple to reach target power.
Negative total power does not make the train go backward; running train will slow down

- Adds invisible engines to add or remove tractive effort.
Values are 10, 20, 50, 100, 200, 500 kN, in positive and negative declinations and in both ELECTRIC and DIESEL for consistency:
All efforts sum.
With any positive DIESEL effort, an electric train can run along unelectrified tracks with sum of all the effort (even electric).
Negative total effort does not make the train go backward.