When? Today? It's 12610 SBC-MAS ICE Exp. 12160/12609 has RSA with 12608/12607 so you might have seen written Lalbagh exp on the board.
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12608 -Lalbagh exp (departs from MAS to SBC as 12609 MAS-SBC ICE )
12610- SBC-MAS ICE exp(Departs from MAS to SBC as 12607 Lalbagh exp).