One feature I like in TSW2 is that if a railroad shares engines and rolling stock with another railroad the paint schemes will show up at multiple locations (CSX rolling stock in CN, UP AC440 in sand patch) so why can’t the cal trans F40ph and coaches show up on the northeastern corridor and the UP GP38-2 show up at sand patch? would be a nice addition imo
To Put it Blunty why would Caltrain lease out there engine and Stock to Amtrak, let alone across the country.
Then make your own scenario. A regional commuter line leasing rolling stock from a commuter line on the other side of the country just ain't gonna happen.