In railways, what is a DMBS coach?

In railways, a DMBS coach stands for a Driving Motor Brake Second carriage.

The key features of a DMBS coach are:

• Driving Motor (DM): It has a driver's cab or compartment from which the train can be driven and controlled.
• Brake (B): It is equipped with a braking system, allowing it to assist in braking the train.
• Second (S): It includes a second-class passenger saloon for carrying passengers in the lower service class.

A DMBS coach combines the capabilities of a motorised driving unit, a braking vehicle, and a second-class passenger carriage into one vehicle. This allowed for the transportation of second-class passengers while also having the ability to operate and brake the train from the same coach.

These types of coaches were commonly used on secondary passenger services or branch lines where having both driving/braking functions and second-class passenger accommodations in a single coach was practical and efficient.