12321 Train Running Status
- Train: 12321
- Name: Howrah - Mumbai CSMT Mail
- Runs between: Howrah Junction (HWH) and Chhatrapati Shivaji Maharaj Terminus (CSMT)
- Running days: Daily
- Coaches: The train has coaches like AC 2 Tier, AC 3 Tier, Sleeper Class, and General Unreserved coaches.