Some Pump Wagons are fitted with a makeshift sail. This makes them faster but more difficult to control.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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If a Pump Wagon has an out-rigga then its Movement characteristic is increased to 3D6. Note that this means that if the crew decide to pump harder then you must roll 4D6 for the Pump Wagon's random movement.