Many years ago, I started up a save on a UK map, with the intention of recreating the entire UK network.
It's not complete, but at last count I was at over 1,000 trains.
The idea was to emulate the station layouts, lines and liveries wherever possible, which has meant some compromises, especially in the south east where things are quite packed in.
I shared this on another part of this server a while back, but as I still come back to this occasionally, so thought it might be nice to have a continuous thread.