Hello I really like the mod it makes building trains quit easy. I would like to give some suggestions.
When playing I use the esc key to back out of in game gui's so making it so this mods gui dose the same would be nice.
I use 2-8 trains for most of the late game but the train foundry can only make 1-4 at max. My thought is making it so you can expand the train foundry by either placing another 1 behind the first, or having a separate expansion bay you can add the the foundry.
Final thought is about adding equipment grid support for mods that add them to locomotives.