On a day when only 151 minutes of play was possible due to drizzle and bad light, last match centurian Mukund made 57 off 142 balls, hitting four boundaries and two sixes.
The 24-year-old was dismissed after he snicked to an incoming delivery from leg-spinner Aasish Yadv and Mahesh Rawat took a neat catch behind the wickets.
At close, Baba Indrajith (39) and captain R Prasanna (zero) were at the crease when played was called off.
Mahesh's decision to bring on off-spinner Arnab Nandi alongside medium pacer Anureet Singh paid off in the sixth over of the day when Railways scalped the wicket of opener Bharath Shankar (4).
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With Nandi operating, Mahesh placed Anustup Majumdar at forward short-leg and Shankar played a turning ball defensively, only to give an easy catch to Majumdar.
First down batsman Baba Aparajith stayed on the crease for sometime before deciding to step out to hit Arnab Nandi. He ended up giving a catch to the bowler. His individual 27 came off 46 balls and contained two fours and a six.
Railway spinners Arnab Nandi (2/62) and Aasish Yadav (2/49) were the wicket takers.
Brief Score:
Tamil Nadu 1st innings: 144-4 in 49 overs (A Mukund 57; A Yadav 2/49).