Everything big IBM makes has built in casters.
Leveling pads are only dropped once it is in place in the computer
room.
Some times it takes a few people to push and
navigate, but even a
370/168 would
roll down the hall when the pads were lifted.
Ditto for a few Amdahls and Fujitsus I've helped to move.
--
Pete Peter Turnbull
Network Manager
University of York
Save for all the DEC stuff I've encountered. Casters and adjustable pads.