supply of insulated rail dolly with attachmentinsulated rail dolly with attachment,insulated rail dolly with attachment for carrying concrete sleeper and rails f or bg as per rdso specification no. tm/sm/24 dt.25.11.1993 or latest. technical specification 1.tubular frame : made of mild steel heavy duty pipe of normal bore 40 mm 25 mm as per required tolera nces . 2. chain : made of alloy steal. 3. hook bolt : made of high carbon steel 4. gusset plate : made of ms f lat or ms plate 5. wheel assembly : for track circuited area : assembly shall consists of two double flanged wheels with cast steel duly insulated the hubs to accommodate the shaft and bearing. [ warranty period: 30 months after the date of delivery ] ] permanent way inspector p gujarat 44.00 numbers