SP 4601
This loco was built as the "cow" unit of a TR6 set in 10/1951 with EMD construction number 15084. As built, she featured as-built, a drawbar connection to the "calf" half of the set, SP 4701, which was quickly replaced with regular couple, dual cab controls and mu capability.
She was assigned number SP 1101 in the 1965 system renumbering.