APU Malfunction! 2 CSX GP38-2s (One with a Dead APU) @ Butler Street 7/2/2002 @thelocomaniacchannel6790
APU Malfunction! 2 CSX GP38-2s (One with a Dead APU) @ Butler Street 7/2/2002  @thelocomaniacchannel6790
Uploaded October 2020 | Updated September 2026, 2 weeks ago
CSX GP38-2's #2506 (ex-SCL #506) and #2714 (ex-SCL #6063) lead a southbound manifest freight at Butler Street Interlocking in Hamilton, Ohio in July 2002.

The flashing yellow light on the side of #2506 indicated that it's Auxiliary Power Unit (APU) is malfunctioning. CSX installed APU's on many locomotives between 2002 and about 2006 in an effort to reduce locomotive emissions and fuel consumption at idle. The purpose of the APU was to maintain the optimal temperature of the locomotive coolant and other liquids and also to maintain power to the electrical systems without running the prime mover.

A defective APU would only impact a locomotive at idle or restart, not in road service.

Ultimately, CSX concluded that installation and maintenance costs on the APU's were too high to offset the savings in fuel and emissions and the program was canceled.

**Originally captured on 8mm videotape**
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APU Malfunction! 2 CSX GP38-2's (One with a Dead APU) @ Butler Street 7/2/2002

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