Conversion from steam to diesel and electric locomotives is proceeding rapidly.
"Area Handbook for Bulgaria" by Eugene K. Keefe, Violeta D. Baluyut, William Giloane, Anne K. Long, James M. Moore, and Neda A. Walpole
The locomotives are modified EMD GP-9s, diesel-electric locomotives built by.
The Caterpillar subsidiary that owns Electro-Motive Diesel Inc, the company that manufactures and sells diesel-electric locomotives .
After diesel-electric locomotives took over all passenger train duties, No 844 was placed in freight service in Nebraska between 1957 and 1959, Union Pacific representatives said.