The 3 UK based steam locos are nice (yea yea i know the third ones not out) and you have jubile getting some upgrades by rivet games (also nice).But one has to wonder why there hasn't been even a clue,hint or peep about a US/German steam loco even being worked on for a future dlc.
I have a feeling they probably want to create a good foundation first in uk locomotives. There's still lots to be improved in the current steam simulation. Matt mentioned how the team is working on improving the firebox logic. Manual firing is also not a thing yet. They're not too large and complex like a big boy for example.