supply of insulated rail dolly , insulated rail dolly with attachment for carring concrete sleeper and rails f or bg as per rdso specification no. tm/sm/24 dt.25.11.1993 or latest. make:- kelvin or rajasth an mining or chandra industrial or similar (technical specification 1.tubular frame : made of m ild steel heavy duty pipe of normal bore 40 mm 25 mm as per required tolerances . 2. chain : made of alloy steal. 3. hook bolt : made of high carbon steel 4. gusset plate : made of ms flat or ms plate 5. wheel assem bly : far track circuited area : assembly shall consists of two double flanged wheels with cast steel duly ins ulated the hubs to accommodate the shaft and bearing.) [ warranty period: 30 months after the date of d elivery ] ]