+91-40-6723 7000    

  1. Driver Console (with TFT LCD displays)
  2. Vehicle Control Panel
  3. Traction Alternator
  4. Rectifier
  5. Diesel Engine (CRDI, EFI, MFI)
  6. IGBT based Traction Converter
  7. Auxiliary Converter
  8. Traction Motors (AC)
  9. Passenger Information System
  10. Vehicle Remote Monitoring

Medha, as a DMU propulsion system developer, offers design, manufacture, supply and commissioning of single or multiple diesel engine based, complete propulsion system along with train control and communications for Diesel Multiple Unit (DMU) vehicles with power rating from 700 HP to 2000 HP.

Interface development with doors, brakes, HVAC, surveillance, fire protection and other sub-systems is to suit customer requirements.

System Features and Advantages

  • Increased power rating of DMU
  • Increased seating capacity (200-350 seating capacity/unit)
  • Longer trains (upto 20 cars per trainset)
  • Improved controls and fault diagnostics
  • Flexibility in selection of engine and vehicle equipment
  • Increased acceleration and shorter braking distances
  • Reduced breakdown and maintenance requirements
  • Implementation of fuel efficient solutions such as common rail, electronic fuel injection
  • WTB / MVB / CAN interfaces for train communication network
  • High level of transmission efficiencies
  • Train speeds of upto 120 kmph for 20 car consists and higher speeds for smaller consists
  • Solutions for different gauge sizes including meter, cape, standard and broad gauge
  • Adherence to standards, emission control norms and applicable procedures
  • System integration test (IEC 61377)
  • Vehicle integration test (IEC 61133)

Meeting Customer Requirements,

New and Rebuild DMUs

Propulsion system designed as an integral part of vehicle design to achieve desired ratings, performance and features


Retrofit solutions to upgrade PLC based car controllers to microprocessor based car controllers with improved vehicle availability and diagnostics


DC traction, high maintenance DMUs converted to IGBT based, low maintenance and high performance AC traction with advanced controls and enhanced power rating

1600 HP DMU - (Medha’s scope)

  • Basic unit: 1 DPC + 4 TC
  • Train consist: 2/3/4 basic units or 10/15/20 cars respectively
  • Max. speed: 120 kmph
  • Initial acceleration 0.47m/s2
  • Passenger capacity (10 car consist): 900 seating, 1800 standing,14 lavatories
  • Engine: 1600 HP, 1800rpm, Cummins/Caterpillar
  • Auxiliary alternator and compressor: directly coupled
  • Alternator: 1.1 MW, 1800 rpm synchronous alternator with inbuilt exciter
  • Traction converter: 2 units, 550kW per unit, underframe mounted, IGBT based and forced air cooled, 32 bit DSP based traction computers, bogie control
  • AC traction motors: 250kW, 3000rpm, self ventilated, axle hung, nose suspended
  • Controls: microprocessor based vehicle control computer, WTB train communication network
  • Driver desk: complete with 10.4" TFT LCD display screen and various controls
  • Battery bank: 24VDC (engine starting) and 110VDC (train auxiliary loads)
  • Passenger information system (audio/visual)
  • Efficiency at full load: traction alternator 95%, diode rectifier 99.5%, traction converter 98.5%, AC traction motor 93%, gear box 98%
  • Overall power chain transmission efficiency approx. 85%

Vision & Mission

To be World Leader in Railway Products

Enjoying Innovation and Applying Technology for improving the lives of people.
Enhancing the image of India in the world, in high technology.

R & D Centre

Behind Mint Compound, Cherlapally, R.R.Dist,
Hyderabad - 500 051 Telangana, India.
Phone: +91-40-6723 7000; Fax: +91-40-2726 4144

Corporate Identity Number:  U31103TG1984PTC004436

MEDHA SERVO DRIVES PVT. LTD. P-4/5B, IDA, Nacharam, Hyderabad - 500 076 Telangana, India
Phone: +91-40-2717 1101; Fax: +91-40-2715 4706