supply of alumino thermic welding portions 52 / 60 kg as approved by rdso for welding of rails 52 / 60 kg for 25mm gap by the process of at welding along with complete accessories confirming to the specification laid down in indian railway standard specification no. irst-19-2012 up to date correction slips with single shot crucible fitted with automatic tapping thimble technology, 3 pieces mould ( zircon washed ) manually pressed for execution of welding of rail joint and compressed air petrol heated techniques including consumable store complete and as directed b the engineer in charge at site. the following accesories shall be supplied. 1. alumino thermic welding portion ( 60 / 52 kg ) as per irs t-19-2012 2. 3 piece pre-fabricated dry mould ( 60 / 52 kg ) as per irs t- 19-2012 3. luting sand 4. ignition match 5. single shot crucible fitted with auto tapping thimble 6. mould shoes ( 1 set for 50 weld portions ) the following accessories shall be supplied 10% extra by the contractor at free of cost. single shot crucible fitted with auto tapping thimble, three piece pre fabricated dry moulds, luting sand and ignition matches. sr.no 2 ( item no- 091012 ) for 52 kg rail, 3 piece mould and compressed air petrol heating technique