List of diesel locomotives of India


This article lists the diesel locomotives that have operated or are operating on Indian Railways.

Classification

Locomotives were classified by track gauge, motive power, function and power in a four- or five-letter code. The first letter denotes the track gauge. The second letter denotes motive power, and the third letter denotes use. The fourth letter denotes a locomotive's chronological model number.
In 2002, a new classification system was adopted. For newer diesel locomotives, the fourth letter denotes their horsepower range. Not all diesel locomotives were reclassified, and the fourth letter continues to denotes their model number.
A locomotive may have a fifth letter, generally denoting a technical variant, subclass or subtype: a variation in the basic model or series, or a different motor or manufacturer. Under the new system, the fifth letter further refines horsepower in 100-hp increments: A for 100 hp, B for 200 hp, C for 300 hp and so on. A WDP-3A is a locomotive, and a WDM-3F is.
The system does not apply to steam locomotives, which are no longer used on main lines. They retain their original class names, such as M- or WP-class.

Syntax

In WDM 3A, W denotes broad gauge; D denotes diesel power; M denotes mixed use, and 3A denotes . In WAP 5, W is broad gauge; A is AC electric; P is passenger service, and 5 indicates that the locomotive is the fifth model used.

Broad-gauge locomotives

Broad-gauge diesel classification codes are:

Passenger class (WDP series)

Goods class (WDG series)

Shunter class (WDS series)

Meter-gauge locomotives

Metre-gauge diesel classification code is:

Narrow-gauge locomotives

Narrow-gauge diesel classification codes are:

Mixed class (NDM series)