INDIAN RAILWAYS MAINTENANCE MANUAL FOR DIESEL LOCOMOTIVES - PART 68
Document No:
Chapter –13 Technological Advancements
Version No: 1.0-d0
Date Issued: dd/mm/yyyy
Document Title: MANUAL MAINTENANCE FOR DIESEL LOCOMOTIVES
Revised 2013
Printed: 2015/03/08
Page 264 of 303
13.
T
ECHNOLOGICAL ADVANCEMENTS
13.1
Induction of Diesel Locos on Indian Railways after Independence-
Chronology
13.1.1
1950-1960: Introduction of Diesel Traction
13.1.1.1 WDM1: Diesel traction was introduced on the Indian Railways with the import of
ALCO locos in 1957. These were classified as WDM1. The salient features are:
• Year introduced: 1957
• Bogie configuration: Co-Co
• Axle load: 18.6t
• 1950 bhp, 12-cylinder 4-stroke turbo super
charged diesel engine
• Maximum Tractive Effort: 27.9t
• Maximum Speed: 104 kmph
• DC-DC transmission
• Single cab design
13.1.2
1960-1970
13.1.2.1 WDM2: Following WDM1 was the WDM2 class of loco, which was introduced in
1962. Forty of these locos were imported as kits which were assembled at the Diesel
Loco Works, Varanasi, which was setup for manufacturing these locos under a transfer
of technology agreement.
The WDM2 was mass produced and become the workhorse for the Indian Railways.
Many improvements and innovations were made on this class of loco for performance
enhancement over the years.
The salient features are:
• Year introduced: 1962
• Bogie configuration: Co-Co
• Axle load: 18.8t
• 2600 bhp, 16-cylinder 4-stroke turbo super
charged diesel engine
• DC-DC transmission
• Maximum Tractive Effort: 30.45t
• Maximum Speed: 120 kmph
• Single cab design
13.1.2.2 WDM2A & WDM2B: These are the technical variants of WDM2.
a) WDM2A:
WDM2s rebuilt to feature Air Brakes. The initial ones had dual brakes.
b) WDM2B:
WDM2s having Air Brakes as standard equipment. Only some were
classified so.
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