The A-3177 (LT-2500) was a diesel-electric transfer-unit locomotive, built by the Lima-Hamilton Corporation between 1950 and 1951.

The A-3177 was the final locomotive model produced by Lima-Hamilton before the company merged with the Baldwin Locomotive Works in September 1951 to form the Baldwin-Lima-Hamilton Corporation (BLH).

All twenty-two units were ordered by the Pennsylvania Railroad, with the last one, #5683, completed on September 12, 1951, the day after BLH was formed.

The PRR ordered 22 more but agreed to receive 23 RT-624s from BLH instead.

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