At stumps, Bengal were 187 for five in their second essay after Railways scored 302 to get a vital first innings lead of 34 runs. Bengal currently have a lead of 154 runs with a day left but not enough runs to force an outright victory on a partially responsive Eden Gardens track.
Veteran opener Arindam Das with another slow-paced innings of 38 off 114 balls was responsible for Bengal losing the momentum. The hosts crawled at a run-rate of less than three per over with little or no intent of trying to force an outright win after conceding the first innings lead.
Earlier, in the day, Bengal's spinners failed to dismiss the final pair of Anureet (26) and Avinash Yadav (12 no), who came together at the fall of ninth wicket at 265.
Skipper Mahesh Rawat top-scored with 71 which had seven fours and was bowled by left-arm spinner Amit Banerjee.
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With four runs needed to take first innings lead, the duo added as many 37 runs but also thwarted the Bengal attack for an hour using up 13 overs in the process.
Brief Scores: Bengal 268 and 187/5 (Wriddhiman Saha 39 batting, Arnab Nandi 2/25)
Railways 1st innings 302 (Mahesh Rawat 71, Saurashish Lahiri 5/99).