@Sanket*: Re# 136920-4
Though thats the rule i doesnt seem to apply in many cases
Eg:
16221/22 has its maintainence in mysore and train to chennai is 6221 and return 6222-works out here
16231/32 has...
more... maintainence at Mysore but train leaving mysore is 6232 and return is 6231
Similar case with 6525/26(SBC maintainence), 2657/58(SBC maintainence), 2607/08 and 09/10(SBC maintainence)