There are three modes of control for the railcar t-crane, one for console control; The other two are handle controls; Three kinds are remote control. The T is made up of spiral arm steel frame, electric block and rotary mechanism. Slewing steel boxes by beams, channels, such as welding type components, electric hoist moving along the beams bottom flange, rectangular steel pipe through welding strengthen the load-bearing column beam, slewing mechanism driven by electric or manual, consists of slewing bearing, gear motor, the motor through reducer drive rotary bearing to job position, meet the construction requirements. T crane slewing mechanism can adopt two methods of manual and electric, if the use of electric drive rotary the whole device needs to consider the possibility of a sudden power outage equipment can't turning, so the equipment has increased in the design of speed reducer and the rotary support emergency separation device, to meet under the condition of no electricity to realize T crane slewing. Manual rotation is carried out by the traction rope of the human traction T.