Earlier, the only 2 pfs (pf 5/6) at Andal that were connected to Andal-Sainthia branch route were small. It used to accomodate only 13-14 coaches. That's why Vananchal exp, the only train that has a LR at Andal used to run with 14 coaches despite of having good demand. That's why all the Asansol bound trains that comes from Rampurhat goes to Durgapur for LR.
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Recently, a new line has been constructed so that pf 4, that can accomodate 24 coacher rake could be connected. Also NI work has been done and...
more... work for increasing the length of pf 5/6 is going on. But still i dont think this train will have LR at Andal in future since Durgapur is a very big city (4th largest in Bengal) and has good political backing.