Hi. The Cowans Sheldon 30 ton 'steam' Crane is, as Rod stated (re-chargable) battery operated. It was made by Roger Marsh who is, one of those 'real quality' engineers here in the UK. This was the second one made, the first was, believe it or not, coal fired. You can see by the way that I was fiddling with the controls on the utube pictures that the operation takes a bit of getting used too. On the live steam version I can imagine you would need a degree of sorts and a lot of time and patience! Basically there are 8 controls here; On/Off switch; Regulator; Reverser; Hoisting brake; Hoisting Clutch; Slewing (rotating) gear shift; Travelling gear shift; Luffing (jib) clutch; Luffing brake; 'withdrawing' gear operated by hand wheels either side of the carriage frame. The control lever quadrant is marked H.R.T.L. For the various movements an arrow indicates the direction of movement when the reverser is in the forward position. When the jib has lifted a small engine, which it can, the relative brake must be applied as this clutch has to be released to allow a second clutch to be applied to slew the jib outwards in one direction or the other. The jib is designed to traverse 360 degrees. One thing that was not apparent on the pictures were the props. Two on each side. Thse are pulled out to the fullest extent and the screw jacks brought down on to suitable wooden packing blocks. Cowans of course also made much larger cranes. With the 30 ton version there were usually a second one present. One at each end. Anyone want to buy a second? Trevor