David
The trains/buses etc. themselves would be just cosmetic, but a DLC adding various transport-related buildings to work on. This could be restoring a station or converting to other functions.
* Bus station/depot
Trains:
* Station/depot
* Railway shed (stores trains)
* Converting a train carriage into another function
* Underground railway station
* Part of an airport
* Turning a section of aeroplane into a business location (such as cafe) or residential
* Cruise liner ship similar to the one in Luxury DLC for HF1