Dinda (2/17 in 8 overs) bowled unchanged for eight overs and was supported well by Amit Kuila (1/8) and Sayan Ghosh (1/12) as they reduced Railways to 37 for 4 in seamer-friendly conditions at the HPCA Stadium.
Left-handed opener Saurabh Wakaskar (4) got a boundary off Dinda's first delivery and the very next one saw the speedster take a return catch.
Former Baroda player Mrunal Devdhar (17) was the next to go as he lobbed one to Pankaj Shaw to give Dinda his second wicket.
Arindam Ghosh (4), who is going through a wretched run was castled by Kuila as Railways still need 169 runs to get a first innings lead.
It will all depend on how well keeper-batsman Mahesh Rawat, whose attacking batting can take the game away in one sesson, performs tomorrow.
Earlier, Karn Sharma called correctly at the toss and rightly put Bengal into bat.
Abhimanyu Easwaran (8) hit a couple of boundaries but was snapped by Rawat behind the stumps off Anureet Singh's (4/66) bowling.
Chatterjee should however be blamed as he has now failed to convert three half-centuries in three matches into three-figure mark. After 73 against UP and 51 against Punjab, the stylish left-hander yet again did all the hardwork before he was undone by a slower from Anureet.
The only significant partnership that Chatterjee had was a 66-run stand for the fifth wicket with Agniv Pan (27).
This was after Bengal were rattled at 62 for 4 with both Manoj Tiwary (0) and Wriddhiman Saha (0) back in the pavilion without troubling the scorers.
Bengal crossed 200-run mark thanks to some lusty blows by Dinda, whose 26-ball-30 had five boundaries.
Brief Scores: Bengal 1st Innings 205 in 69.5 overs (Sudeep Chatterjee 85, Ashok Dinda 30, Agniv Pan 27, Anureet Singh 4/66, Amit Mishra 3/38)
Railways 1st Innings: 37/4 (Mrunal Devdhar 17, Ashok Dinda 2/17).
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