The EMU stock is employed for short distance sub-urban services (up to 150 Kms)having frequent stops and starts. MEMU stock is used for medium distance (300 to 500 Kms) passenger transportation on the existing track, signaling, and overhead electrical supply systems.

Each EMU/MEMU train shall have 1 (one) driving coach at each end. One basic unit ofEMU / MEMU shall comprise 1 (one) motor coach and 1(one) trailer coach.The lengths of 9- coach formation EMU train and 12-coach formation MEMU train presently running on Indian Railways are 195 meters (approx.) and 267 meters (approx.) respectively.

This shall be considered as the basic train length of one EMU and MEMU train, however, it shall be possible to add one or more basic unit(s) to increase the length of EMU and MEMU train up to 400 meters.The number of passengers to be carried in one basic train length as specified in clause no. 1.1.5 of these Standards and Specifications shall not be less than 3900 passengers for EMU train and 3300 passengers for MEMU train.

Out of the above total number of passengers, seated passengers shall not be less than 630 passengers for EMU train and 790 passengers for MEMU train. For the calculation of payload,  the average weight of one passenger is considered as 65 (sixty-five) Kgs.

The specific energy consumption calculated as kWh per 1000 Gross Tonnes Kms(KWH/1000 GTKm) is not more than 30 KWH/1000 GTKm for schedule speed (i.e.distance/(runtime + stop time)) of 45 Kmph (approximately)  with scheduled stops.

The stop time given is considered as 30 seconds.

In the event of failure of one motor coach, the EMU / MEMU train is able to complete the journey up to the destination.

Use of materials likely to cause environmental damage:

The following materials are not used:

  1.  Asbestos
  2. Chlorofluorocarbons
  3. Polychlorinated Biphenyls (PCBs)
  4. Exposed Lead and paints containing lead
  5. Chromates
  6. Cadmium
  7. Cyanide.

Nominal clear height inside the coach is 2100 mm. Each coach is provided with two dry powder type or other appropriate fire extinguishers located near the gateways. It is provided with lightweight luggage racks in each coach at a suitable height above the passenger seats. Due care is taken in its design so as to avoid any injury to the passenger.

The EMU and MEMU coaches have minimum 08 (eight) sliding bi-parting doors, 04 (four) on each side.Dual tone (low tone and high tone) pneumatic horns without rubber parts are provided facing outwards at each driving cab. The horns are of sufficient size and power to provide the sound level of 125 dB at a distance of 5 meters from the driving cab.Controls are provided in close proximity to the driver permitting the driver to operate either horn individually or both horns simultaneously.

The high tone horn shall have the fundamental frequency of 390 +/- 25 Hz and the low tone horn shall have the fundamental frequency of 290 +/- 25 Hz. The sound level of the horn as measured in the associated driver cannot exceed 92 dB.

Each driving cab shall be provided with the following:
  • Two cabinets in the rear and locker for toolbox
  •  Two fire extinguisher
  • One LED-based rechargeable torch socket and charger
  • Space/room for installation of wireless set and automatic train protection/auxiliary warning system/train protection warning system equipment
  • Suitable trays with clamps for working timetable, caution orders, walkie-talkie etc
  • Suitable LED-based lighting in the cab. Lighting on the driver’s console shall not be less than 60 lux measured at the console.
  • The cab is provided with ceiling lights designed to provide 200 LUX at 1 meter above floor level.
  • There shall also be the provision that during the running of the EMU/MEMU only driver desk, timetable and caution order area shall be illuminated without causing any hindrance to the visibility of drivers.
  • Destination indicator (head code) shall be provided on the driving coach face.
  • The head code box is behind the lookout glass and flushed with the driver cab interior.
  • A modern high resolution LED display in both English, regional language and Hindi is provided which shall be visible clearly from the platform from the distance of 100 meters minimum (in bright daylight) while the train is approaching the platform.
  • Data input shall be from the driver’s console as a part of setting up procedure.

The viewing angle for the destination indicators is such that it is visible to the person standing on platforms such angle from his eyes to the destination board shall be 30 degrees minimum.

The brake system comprises the following types of brakes:
  • Electric regenerative service brakes
  • Electro-Pneumatic (EP) service friction brakes
  • Brake-pipe controlled backup brake system
  • fail safe emergency pneumatic brakes
  • spring applied pneumatic release parking brakes.

It is possible to apply emergency brake from the drivers’ control position. The emergency braking system is designed to optimize the Train retardation and shall not be degraded by wheel slide protection equipment is provided.Brake alarm pulls shall be provided in the compartments and lavatories of the coaches.

Provision is made for a warning signal to be given to the driver and/or guard in the event of passenger alarm being pulled in any coach. The operation of the alarm pulled by a passenger shall not act directly on the train brakes but the brake operation shall be left to the decision of the driver/guard. An audio-visual indication is provided to identify the coach and the location inside the coach from where the alarm pull has been operated.
It shall be possible to reset passenger alarm system from outside the coach.

Marking of coach number :

The coach number is painted on both sides of each coach, both externally and internally and also inside the cab to be easily visible to the driver and maintenance personnel.

Head light, marker, and tail lights:
The front end of each driving coach is provided with:
  • Head light – Twin beam head lights are provided at each end, working on 110 V halogen lamps having two filaments or LED lamps.
  • Headlight units are refocused, capable of giving minimum 3.2 lux at a distance of 305 meters. The head light will work in neutral section.
  • Tail light (blinking at a rate of 55-65 flashes per minute during the service)
  • Flasher light: flashes at the rate of 40 +/- 5 flashes per minute.
  • Two twin marker lights with suitable waterproof enclosures conforming to IP 65 and window toughened front glass. Each twin marker light is provided with one white and one red array.
  • The marker lamp shall have a nominal light output of 40 LUX at 1 meter.The marker light shall work in the neutral section.
  • These shall work on the battery supply.
  • A separate switch is provided in the driver’s cab to switch ON/OFF the auxiliary head light independent of head light and tail light(Normal & blinking operation).
Event Recorder:
  • Event recorder event recorder will monitor and record various events so that data is available for analysis to assist in determining the cause of the accident, incident or operating irregularities.
  • The equipment shall be designed in such a way so as to provide the intelligence based recording of the following parameters against the time axis (time interval shall be decided by recorder itself whenever there is a change in the respective parameter).
  • Most recent data for below-mentioned events for a minimum of the last 30 minutes in loop form shall be recorded.
The following parameters shall be recorded:
  • Speed in Kmph
  • OHE voltage
  • OHE current
  • Tractive/braking effort
  • Battery voltage
  • Brake pipe pressure
  • Pantograph up/down position
  • Status of main circuit breaker i.e., open/close
  • Mode of operation i.e., traction mode/braking mode
  • Direction of travel i.e., forward/reverse with respect to activated cab
  • Head light status on/off
  • Flasher light status on/off
  • Horn status on/off
  • Status of penalty brake application
  • Wiper on/off
  • Any other parameter considered necessary.
Stationary EMU/MEMU :
Noise level inside the coach and cab.

The noise level inside the coach and the cab shall not exceed 68 dB (A) with all auxiliary equipment operating at its greatest noise output. The noise level shall be measured in the coach along the center line between 1200 mm and 1600 mm above the floor and at a distance of 600 mm from the end of the coach.

Noise level outside the EMU/MEMU :

The noise level outside the Train shall not exceed 68 dB (A) with all auxiliary equipment operating. The noise level shall be measured at a point 7.5 m from theEMU/MEMU centerline at a point between 1200 mm and 1500 mm above the rail level.

Moving EMU/MEMU:

Noise level inside the coach and cab noise level when running at the scheduled maximum speed shall not exceed 72 dB(A). The noise level shall be measured in the coach along the center line between 1200mm and 1600 mm above the floor and at a distance of 600 mm from the end of the coach.

Noise level outside the EMU/MEMU:

The noise level when it is moving at the scheduled maximum speed shall not exceed 85dB (A) with all auxiliary systems operating. The noise level shall be measured at a point 7.5 m from the EMU/MEMU centerline at a point between 1200 mm and 1500 mm above the rail level.

Fire detection system:

The EMU and MEMU have a fire detection system. This is capable of detecting a fire in any coach or driver’s cab. On detection of a possible fire by means of suitable detection, the system has two levels of response that shall indicate the coach involved, the level and the location to within less than 8 (eight) meters (measured longitudinally) of the coach in which the possible fire is located.

The two-level of alarm shall be:
  1. First alarm: sent to the driver indicating that a fire may have started and that this is a first stage alarm.
  2. Second alarm: if the detection system detects a large heat source or denser smoke it will send a further alarm to the driver indicating that this is a second stage alarm.The second stage alarm shall also be sent to the coach involved to alert the passengers.

The audio-video indication for second stage alarm in the coaches shall be provided near the niche provided for fire extinguishers.In the event of detection of a fire, the ventilation and air-conditioning system shall be controlled to minimize the spread of fire to promote the escape of passenger. In the event of detection of smoke outside the EMU/MEMU, an alarm shall be provided to the driver. The driver shall then be able to remotely close the ventilation and airconditioning unit’s fresh air intake.

The permissible speed at turnouts:
  • 1 in 8½ curved switch 52/60 Kg on PSC sleepers 15 kmph
  • 1 in 8½ symmetrical split with curved switches 52/60 Kg on PSC sleepers 30 kmph
  • 1 in 12 curved switches 52/60 Kg on PSC sleepers 30 kmph
Maximum Superelevation:

165 mm for group A, B and C routes,140 mm for group C, D and E routes (in special case 185 mm for group A

  • Group ‘A’ – Speeds up to 160 Kmph
  • Group ‘B’ – Speeds up to 130 Kmph
  • Group ‘C’ – Suburban Sections Of Bombay, Delhi, and Calcutta
  • Group ‘D’ – Sections where the sanctioned speed is 100 Kmph at present
  • Group ‘E’ – Sectional and branch line with the present sanctioned speed less than 100 Kmph
  • U – UNIT




  • First class: 26
  • Second Class: BACD 98+112+110+88(62+26)
  • Total: 408
  • Maximum operating speed: 100 Kmph
  • Maximum permissible speed: 80 Kmph

Note: The permissible speed may be verified through WTT on specified sections.

Train Performance:
  • Motor Hp one hour rating: 1004 HP (251×4)
  • Continuous rating : 896 HP (224×4)
Tractive effort:
  • One hour rating: 5700 Kgs.
  • Continuous rating: 4800 Kgs.
  • Speed in KMPH on continuous: 52.25 Kmph
  • One hour: 54.5 Kmph
  • Tangent Track with crush load: 1.6 Kmph/Sec.