waise BG sir ek baat kahna chahunga.......... kuch slow express aur passanger trains ke liye........ loco link fix nahi hota.............maine ise kabhi WAP-4 ke sath dekha , kabhi WAM-4 aur kabhi WDM-3 (even after electrification ) to kuch kah nahi sakte.......... kya loco link rahega........... ha lekin IMP trains ke liye loco link fix hota he , jaise 12415/16 ke liye WAP-7 fix he.........................