Booster Units

• 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.