There is a move to utilise the idle rake at SBC by extending it to MYS. I have an alternate suggestion.
Extend CSTM-SBC Udyan to Salem with Dep SBC by 0930 SA arr 1330. This can have RSA with 11063/11064/12163/12164 SA-MS-DR rake which is idle at Salem and go in the night to MS and continue as MS-DR.
DR-MS-SA rake which arrives at SA in the morning 0630 is idle till night at SA. This rake can start from SA by 1530 to arrive SBC by 1930 and continue as Udyan from SBC....
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All these trains are CR trains and hence with proper RSA arrangements, this can be managed. SA gets a daily train to SBC/Mumbai. Idling problem of Udyan rake as well as DR-MS-SA are avoided.