In later years they were used as fuel cars for moving 'user quantities' outlying areas for locomotives and M/W equipment. The last one in existence, I think, was located in Binghamton for many years near the DL&W depot. Was later purchased and moved to Middletown and sat at the M&NJ for a few years. The tanks and upper carbody/equipment were scrapped and the flat car used for captive M/W service. Bodies consisted (above the flat car) of two steam locomotive tender cisterns with coal bunkers removed and covered, an old feedwater pump from a steam locomotive, a boxcar roof and body panels for the pump house, and the two 'doghouses' over the fill hatches on the ends. The car that I mentioned had a Coffin feedwater pump. The tender cistern from one end of the car survives, slowly being converted back to a locomotive tender for former LS&I 23 at Kingston.
The cars were originally built by the New York Central for fire train service and carried water and equipment for firefighting. There were several built and all of various spare parts, so they all had individual looks.
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What the #*** did we just hit, Over ???