Young guns Nitish Rana (89) and Anuj Rawat (74) continued their good form as Delhi reached 318 for six against Railways at stumps on day one of the Ranji Trophy group A encounter.
All rounder Mannan Sharma (68 batting) also got his second fifty in as many matches.
Rana and Rawat carried on from where they had left off against Assam in the opening encounter after Delhi's top three Gautam Gambhir (2), Unmukt Chand (11) and Dhruv Shorey (16) were out cheaply with scoreboard reading 44.
Nitish, who faced 145 balls hit 12 boundaries as he again peppered the off-side field with cut shots and some flowing drives on the on-side.
Along with debutant Himmat Singh (45), Nitish added 109 runs for the fourth wicket.
However Himmat missed a chance to score a debut half century when he was caught behind trying to cut Avinash.
After his impressive debut, Rawat looked more assured alongside Rana, playing both cuts and drives on the off-side.
As Nitish was looking good for his second hundred, he came down the track to a flighted delivery from Shivakant Shukla to be stumped 11 short of three figure mark.
Just like last match, the two left handers Rawat and Mannan batted with ease. The low bounce of the pitch and slowness made it easy to adjust.
Rawat again showed good temperament as he faced 152 balls before Anureet Singh (3/71) got him at the fag end of the day.
Tripura reach 244 for 7 on day 1
Chennai: Smit Patel (99) and Yashpal Singh (96) missed out on centuries, but helped Tripura recover from 41 for 3 to reach 244 for 7 at stumps on the opening day of the Ranji Trophy Group "C" match against Tamil Nadu here on Saturday.
The 24-year-old Patel fell while going for a big hit off M S Washington Sundar's bowling and was well caught by J Kousik, one short of a well-deserved ton.
Yashpal Singh provided Ashwin his first wicket of the innings when he edged a catch to Dinesh Karthik for 96.
Gurinder Singh fell in the 88th over as Tamil Nadu hit back towards the end of play after a tough second session.