The Amtrak Cab-bags were originally built by EMD as FP40PH model engines. In 1996 they began reappearing with their Prime Mover (the actual diesel engine) removed and baggage doors added. Since the controls were left in place they can be used to control an engine at the other end of the train.
Videos
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Amtrak engines 98 & 90213 fly 693 through Cumberland Center on November 7th of 2020. Video by John Erickson.
Amtrak engines 86 & 90214 fly 681 through Cumberland Center on December 31st of 2020. Video by John Erickson.
Amtrak 86 and 90224 take Downeaster 681 through Hillside in Brunswick on January 15thof 2021. Video by John Erickson. This video is also on youtube.
Amtrak 97 and 90220 with Downeaster 683 at Mountain Jct beside a rail train on April 20th of 2023. Video by John Erickson.