manufacture and supply of 6400 mm curved switches with zu 1 60 60e1a1 thick web tongue rail for 1 in 8 5 turnout bg 1673 mm for 60kg uic 60e1 on psc slee pers to rdso drg no t 6280 alt 4 or latest alteration modification if any up to the date of tender closing with supplier s rails complete set with all parts and fittings bolts nuts plate screws insulated tie plates and nylon cord reinforced grsp etc as listed in the drawing t 6280 alt 4 or latest and excluding standard fish plates fish bolts