Amtrak diesel locomotive 505, an EMD SDP40F SN 72694-6 at Dallas, Texas in June 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak diesel locomotive 505, an EMD SDP40F SN 72694-6 at Dallas, Texas in June 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak diesel locomotive 506, an EMD SDP40F SN 72694-7 at Dallas, Texas on June 22, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak diesel locomotive 506, an EMD SDP40F SN 72694-7 at Dallas, Texas on June 22, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak passenger train passes Reunion Tower in Dallas, Texas on June 22, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak passenger train passes Reunion Tower in Dallas, Texas on June 22, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak passenger train passes Reunion Tower in Dallas, Texas on June 22, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Burlington Northern 8162 in Fort Worth, Texas on September 27, 1981. Number 8162 is a SD40-2 built by the Electro-Motive Division of General Motors (EMD), builder's number 786256-73.

Burlington Northern diesel locomotive 5638, formerly Chicago, Burlington and Quincy 558, at Amarillo, Texas, on June 28, 1978. Number 5638 is a U25C built by General Electric, builder's number 35605. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.

Burlington Northern diesel locomotive 6078 at Fort Worth, Texas on June 7, 1981. Number 6078 is an SD7 built by Electro-Motive Division (GM), builder's number 17260. The locomotive is sub-lettered for the C&S ( for Colorado & Southern).