Bユニット
The consist had an A1A-A1A+2-D+D-2, wheel arrangement, 18 axles of which 12 were powered. The PA-1's diesel engine was retained and the B unit carried the main power plant for the main generators, which contributed for a total power output of . The coal tender was rebuilt from that of Challenger steam locomotive number 3990. The setup was numbered 80, but changed to 8080 in 1965 to avoid conflict with the new EMD DD35s then being introduced.