NJT 4100 & 4200​

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Unlike their earlier 4100s ( GP40PH-2 ) counterparts, the 4100s

( GP40PH-2A ) and 4200s ( GP40PH-2B ) were built by reconstructing freight use GP40s instead of using GP40P passenger locomotives. Their frames were extended to accommodate the HEP ( Head End Power ) APU, with an extra fan and exhaust pipe near the rear of the engine bay. The GP40PH-2A ( only marked as GP40PH-2 ), was rebuilt by Morrison-Knudsen, while the GP40PH-2B was rebuilt by Conrail.

The GP40PH-2A was numbered #4145-#4150, for a total of only 6 locomotives. In 1996, #4148 was involved in a collision, and sent for repairs, returning as #4219. While it is grouped with other 4200s, it is still marked as a GP40PH-2. Before their retirement, the GP40PH-2A had their final runs on the Atlantic City Line as the 4000s ( PL42AC ) were banned from the line due to excessive vibration. #4145 was later sold to MARC of Maryland, for use as a rescue locomotive. Today, only #4145 and #4219 ( #4148 ) remain in service, with the others retired at the MMC and used for parts.

The GP40PH-2B are numbered #4200-#4218, and #4219 for a total of 20 locomotives, making them the most common type of GP40 currently active on NJT. Two locomotives; #4205 and #4213, are painted into the " Speed Stripe " livery of NJT. In 2023 #4210 was painted into the livery the Erie Railroad and in 2024 #4208 was painted into the livery of Conrail.