Arindam Ghosh scored a century in CAB's experiment of four-day Super League final under lights at Eden Gardens.
Responding to Madhya Pradesh's 181 in the first innings, Railways rode on Arindam's unbeaten 113 to end Monday on 253 for seven.
Gurkeerat Singh Mann finally took the team to victory as he reached yet another half-century.
Bengal who resumed on 274 for eight on Day 2 were bowled out for 317 in their first innings.
Bengal qualified for the semi-finals of the Ranji Trophy 2013-14 by beating Railways.
Uttar Pradesh sealed their berth in the Ranji Trophy quarter-finals after their final match.
Ghosh and Rawat hit unbeaten centuries to take Railways to a solid 460 for four.
Arindam Ghosh and Mahesh Rawat shone Railways reached 301 for four.
Bengal selectors have retained the squad, which topped the East Zone leg to reach quarter-finals, for the all-India knock-out stage of the Vijay Hazare Trophy,
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