I would like to see a fun optional sound mode that you can turn on in the menu, where the train noises and clanking sound from tracks are all created from DTG staff trying to emulate the sounds with their voice. You could even charge for a "Class 166 Fun Sound Pack" for example in the store or maybe it gets enabled as some sort of reward.
With all due respect, I can’t see this being a big appeal nor would I want the staff spending their time on this as there are loads of more important things they could be working on.