Have recently bought one of these to go into my dockside section. I'm planning on having it turn using a servo motor controlled through a MERG board - basically a spare channel on one of the points control boards. The crane will live here, straddling the tracks but won't be mounted on rails - in fact I may cut the legs down a bit.
Am finding it a right pig mitreing these Bachmann dockside sections - didn't realise they were made from such hard material! They're obviously designed only to be used at right angles.