What General Electric partnership marketed the Union Pacific GTELs?
Union Pacific GTELs:  The prototype, UP 50, was the first in a series built by General Electric for Union Pacific's long-haul cargo services and marketed by the Alco-GE partnership until 1953. Alco-GE: Alco-GE was a partnership between the American Locomotive Company and General Electric that lasted from 1940 to 1953.
Alco-GE