Well before the Texas summer heat sets in have been out & about. At Caldwell there is a BNSF flyover of the UPRR so naturally a shot of the locos of both RRs at the same time would be terrific but so far no luck. I did see NSRR locos deep in the heart of Texas powering a BNSF train. There was NSRR locos powering a UPRR train @ Buda as well. Also there were KCS locos powering @ UPRR train at Caldwell. You can access the pix by going to myrailpix.com then the Texas March 2008 gallery to view them 
Direct Link to Gallery.
Thanks, Chris…