unloading of coal from the rake of boxn wagons within railway free time , loading of coal ( unloaded from boxn wagons ) into tippers and transporting the same to patherdih nlw washery raw coal tube stacker or raw coal hopper . as per nit , mechanical unloading and manual cleaning of wagons/ box along with allied jobs such as opening and closing of wagon doors , cleaning of tracks etc . of coal from rake of boxn wagons within railway free time for each rake . , loading of coal in to tippers from stock pile by pay loader including cost of all materials , labour and ancillary works etc . complete job as per direction of engineer-in-charge . , transportation of coal on the specified route by tippers including unloading of coal up to a lead slab as indicated including cost of all materials and labor etc . complete job as per direction of engineer-in charge . lead slab: ( 0-1 ) km , weighment of coal at patherdih nlw washery-weigh bridge , total impact of gst for the purpose of ctc