This loco was built in 4/1956 with EMD serial number 21309 as a roadswitcher, model SD9. She was built with boiler controls, but without a steam generator or water tank for reserve passenger service. This meant that she needed a trailing unit such as an F7B to operate in multiple with to provide steam heat to a passenger train. She also featured dual fuel tanks for dual fuel operation. She was painted in standard for the time "black widow" colors and featured a full 5 light headlight arrangement on each end.

She was assigned number SP 3957 in the 1965 system renumbering.

She entered the GRIP program and emerged as SP 4341 on 03/24/1971.

SP 3957:

SP 4341:

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