Fran, here's a bit of lateral thinking ....
You're moving the 'game' on with your accuracy in the coaches, trucks, and locomotives proposed, in progress and already produced ....
There are PLENTY of companies, including H and B producing scenery, but there's something MISSING .... which had been produced 40+ years ago ...
Scale roads, cars, etc. ...
There must be a huge potential for WORKING cars, trucks, vans, realistic roads .... even Motorways ....
Just a thought.
Al.