Monorail for DG Set.

It may be a monorail mounted on ceiling above DG set on which a travelling chainblock could be hung to overhaul DG set.

Most monorails in an area you vaguely described are used during maintenance operations to aid in moving large components around a location that requires frequent moving of large items...........

monorail

Most large Gensets will require a permanent base to "rest" because they get real tired pushing electrons back and forth. So bolting may be necessary. Grouting (not concrete) may be necessary after leveling and aligning. I would definitely ask the the vendor who made the Diesel Generator.

Norm3