Abstract: A system and apparatus that eliminates the need for constructing a platform the length of a structure and further eliminates heavy machinery as a means of transportation or conveyance of a work platform. The system provides a rail member in combination with a plurality of bearing races for rolling bearings which allow the hanging platform to move by mechanical means along said supported rail member. The system provides a work platform or equipment cart that moves smoothly along the rail member from a first terminus to a second terminus as necessary for the transportation or conveyance of materials, equipment or persons.

Abstract: A system and apparatus for constructing a work platform under a bridge deck that has a decking segment that moves under the bridge deck from one end to the other as work progresses, eliminating the need for constructing decking under the entire length of the bridge deck. The decking segment hangs from a plurality of trolleys that move along a plurality of rails beneath the bridge deck, the trolleys moving the decking segment from one end of the bridge deck to another. The trolley has at least one main wheel that runs on the tubular rail top and a plurality of side wheels that maintain the trolley on the tubular rail, the trolley smoothly moving along the tubular rail.

Abstract: A system and apparatus for constructing a work platform under a bridge deck that has a decking segment that moves under the bridge deck from one end to the other as work progresses, eliminating the need for constructing decking under the entire length of the bridge deck. The decking segment hangs from a plurality of trolleys that move along a plurality of rails beneath the bridge deck, the trolleys moving the decking segment from one end of the bridge deck to another. The trolley has at least one main wheel that runs on the tubular rail top and a plurality of side wheels that maintain the trolley on the tubular rail, the trolley smoothly moving along the tubular rail.

Abstract: A system and apparatus for constructing a work platform under a bridge deck that has a decking segment that moves under the bridge deck from one end to the other as work progresses, eliminating the need for constructing decking under the entire length of the bridge deck. The decking segment hangs from a plurality of trolleys that move along a plurality of rails beneath the bridge deck, the trolleys moving the decking segment from one end of the bridge deck to another. The trolley has at least one main wheel that runs on the tubular rail top and a plurality of side wheels that maintain the trolley on the tubular rail, the trolley smoothly moving along the tubular rail.