1. Send the train to the depot
- Send the train into a depot (add the depot to the schedule of the train)
2. Sell the old engine
- Open the depot
- Click on the old engine to disconnect it from the train
- Change to sell mode
- Sell the engine
3. Buy a new engine:
- Change to 'Put in front mode'
- Buy a new engine
If you buy a new engine you should check the top speed of the wagons. If the top speed of the wagons is lower as the maximum speed of the engine, they will slow down the train.
As example the following wagon will slow the engine from 200 km/h to 120 km/h.
Waggon max speed: 120 km/h
Engine max. speed: 200 km/h