Added the new Booster Unit to the Caboose mystery draw. Each Booster Unit allows you to attach one additional engine for a single trip.
Booster Units stack, supporting trains with up to six engines. Booster Units attach automatically when you select additional engines.
They are consumed when the trip finishes and returned if the trip is cancelled.
Balance Improvements
Train drag now scales against total engine capacity instead of raw car count. Multiple engines now combine their pulling power and speed more effectively.
Slower helper engines no longer limit the entire train to their top speed. Large multi-engine trains can now reach practical speeds with heavy loads.
Improvements
The Depart button is now disabled whenever the train cannot legally depart. Removing an engine will immediately disable departure if the remaining engines cannot pull the train.
Improved performance when calculating live train speed and trip projections. Added visual support for Booster Units in train consists.