modified trunion assembly for brake gear arrangement for wap4 locos to rdsos drg no s kel 4559 alt 2 sheet no 1 to 4 of rdsos modification sheet no elrs ms 0284 rev 2 dated 17 04 2007 warranty period 30 months after the date of delivery quantity tolerance 5 age item category normal total po value variation permitted max 8 lacs