Vintage Burlington Northern Transfer
The BN assigned several sets of SD7’s and SD9’s to Fort Worth for use on the numerous transfers to and from its interchange partners.
You could frequently see these transfers in the Tower 55 area as they would have to traverse the renowned interlocking to reach the MP, SP and MKT yards.
Due to quirks in Colorado and Texas state law, the Colorado & Southern and Fort Worth & Denver were required to operate as legally independent subsidiaries of the CB&Q, later the BN.
It wasn’t until the early 1980’s that changes to state law took place that finally allowed the BN to legally merge the C&S and FW&D into the BN system.
I remember seeing several sets of those units during my many trips thru Ft. Worth