Batting first, Kaushik's 100 off 118 balls with 10 fours helped Railways reach 255 for nine and they then bowled out UP for 219 in 47.4 overs.
During Railways innings, Kaushik was ably supported by Arindam Ghosh (28) in a 88-run second wicket stand and skipper Mahesh Rawat (46) in a 87-run third wicket stand.
For UP, left-arm pacer RP Singh grabbed 4/50 while Praveen Kumar was hammered one for 61 in 10 overs.
Bengal discard Nandi bowled some cleverly flighted deliveries as most of the UP batsmen were dismissed trying to hit him out of the ground.
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Nandi, who has played five first-class and 21 List A matches for Bengal has been discarded by his home state and is turning up for his employers Railways for the first time.
Brief Scores: Rajasthan 255/9 in 50 overs (Abhishek Kaushik 100, Mahesh Rawat 46, RP Singh 4/50, Praveen Kumar 1/61)
UP 219 in 47.4 overs (Umang Sharma 59, Arnab Nandi 5/46).