I live in Texas and the tracks closest to mine have run Union Pacific locos for as long as I can remember. I guess now that I'm starting to get back into model railroading I've noticed that almost every train has diesels from any railroad, not just Union Pacific like it used to be. For example that last train I saw had 2 Union Pacifics, one CSX and a Norfolk Southern engine. Another time I saw a Conrail, BNSF with 3 union pacific locos. I also noticed CEFX running with UP as well. So this got me wondering, are all the railroads merging together or something? Most people like to model their nearest railroad but now that I have 3 N scale Union Pacific SD90's it sometimes looks out of place with the trains I see now with multiple railroads having their engines pulling the train.