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The Brooklin roundhouse in Portland, Or. has a short drop table large enough for diesel/car wheels. It sits in a pit that runs perpendicular to the track it services. The pit is about 12 feet deep and 5 feet across. About 6 feet below floor level is a set of rails running the length of the pit. A four wheeled trolley rides these rails to carry a wheel set with the table lowered to a set of rails at floor level between stall tracks that lead out the back of the roundhouse. The table can then be raised to floor level to onload the wheels to this track. The trolley has a large hydraulic cylinder the same as you would see in an older auto shop with a below the ground car lift. The cylinder is raised and lowered with water, with a set of valves and a small pump nearby. The trolley is shuttled back and forth with an air powered come along and a cable. The table itself sits at the top of the hydraulic cylinder with two short sections of rail bridging the gap across the pit. When the table is fully raised, a lever moves locking pins into notches in the pit walls to allow the table to bear weight. I have heard in the past that Albina yard also had or has a drop table, and that it was or is large enough for steam locomotive drivers, but cannot say any more than that.
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