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Two air hoses?
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The rotary dump cars with rotary couplers on both ends have been around since the beginning of high volume rotary dump unit coal and rock train service. Originally, there was one in the middle of each unit train consist to reverse the direction that the rotary couplers point. Ahead of this car, the rotary couplers were on the front and behind, on the rear. This was to accommodate the fixed coupler on the locomotive and the fixed coupler on the caboose, so that the entire consist could be run through the dumper without breaking the train. <br /> <br />Now, on many roads, you're just as likely to see a double rotary car, but since there's no caboose, it's there to accommodate the DPU(s) on the rear of the train. You still have to reverse the couplers because that locomotive on the rear also does not have a rotary coupler.
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