From the changelog
Added train part buying
- To buy a missing part, you need to reach step 3 (Order Missing Parts) of the vehicle restoration process
- Paying is done at the museum’s office cash register
- Once paid, the missing part will await at the designated loading track
- To pick it up you must bring a utility vehicle to the loading track (jump to 6:58)
- Interact with the cargo transfer machine, like you normally would for freight
- Bring the loaded utility vehicle to the museum and park
- The part will be automatically unloaded and installed to the vehicle it’s intended for
- Transported train parts cannot be damaged