Howrah–Mumbai CSMT Mail (via Nagpur), with train numbers 12810 and 12809 is a Superfast Express train belonging to Indian Railways and maintained by South Eastern Railway that runs between Howrah Junction in West Bengal and Mumbai CSMT in Maharashtra.

After 2010, due to the 5-digit numbering scheme directive by Indian Railways, train numbers were changed to 12810 UP for Howrah - Mumbai Mail and 12809 DN for Mumbai CSMT - Howrah Mail.

This train service, in its current iteration, runs with 22 LHB Coaches.

Halts of this service are listed below: It is hauled by a Santragachi Loco Shed or Tatanagar Loco Shed based head on generation equipped WAP-7 electric locomotive from end to end.

Cause of the incident was explained as collision by an already derailed freight train at 120 km/h (75 mph).