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 GP38-2 Number 2150, built June 1980; SD7 Number 6087, former Fort Worth and Denver Number 857; at Dallas, Texas on May 27, 1981. Sub-lettering for Fort Worth and Denver on Number 2150. Photo by Al Christianson.