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DIESEL ELECTRIC MULTIPLE UNITS

The steady growth of commuter traffic with a changing pattern to meet such demands for fast growing cities such as State Capitals, Industrial towns etc. has made it essential for the Indian Railways to adopt a new approach to meet the ground realities which are as under:

-Some arterial routes are not necessarily electrified.

-Even the electrified routes cannot support the conventional wide bodied suburban EMUs due to restrictive clearances, low level platforms on the routes and limitations of line capacities.

To overcome these constraints, ICF has developed a prototype Diesel Electric Multiple Unit (DEMU) which has the operational features of fast acceleration and braking with air-brakes enabling it to function as a stopping train but maintaining the average speeds to match the fast Mail or Express train so that it does not slow down the system.

The coach consisting of 1 Driving Power Car (DPC) and 2 Trailer coaches (TC) can run in multiple units of 3, 6 or 9 coaches and cater to the demands of commuter traffic on both the electrified and non-electrified sections without the need for raising the platforms which is a costly process.

The DEMU is designed for a seating capacity of 72 passengers in Driving Power Car and 108 passengers in each of the trailer coaches. Liberal space for standing passengers has also been provided by eliminating the end toilets. Under dense crush load conditions, a unit of 3 coaches will be capable of carrying as many 800 passengers.

These coaches have been provided with cushioned seats and tinted glasses on the windows and adequate fans and fluorescent lights for the comfort of the passengers. These coaches are also provided with UIC type of vestibules as available on coaches abroad. Special care has been taken in the design of the DPC to reduce the noise and vibration levels.

The Driving Power Car (DPC) is provided with a 700 hp on-board Kirloskar Cummins Diesel engine with a well-integrated NGEF Alternator to supply power to the traction motors. Train control is achieved through a technologically advanced electronically controlled system.

The inclusion of one Driving Trailer Coach (DTC) in a single unit formation enables easy operation with only on Driving Power Car (DPC). Thus, Irrespective of whether operated as a single, or, as a multiple unit, reversal of the train direction will not pose a problem. This DEMU is capable of running at a maximum speed of 100 Km/h.