Indian locomotive class WDM-4


Type and origin
Power type Diesel
Builder Electro-Motive Diesels
Model GT16; SD-24
Build date 1962
Total produced 72
AAR wheel arr. C-C
UIC class Co-Co, Co'Co'
Gauge 1,676 mm (5 ft 6 in)
Bogies Flexicoil Mark I cast steel
Loco weight 112,800 kg (248,700 lb)
Fuel type Diesel fuel
Engine type two-stroke V16 diesel
Aspiration Turbo-Supercharged
Cylinders 16
Transmission Diesel electric
Train brakes Vacuum
Performance figures
Maximum speed Restricted: 120 km/h (75 mph)
Running: 130 km/h (81 mph)
Rated: 140 km/h (87 mph)
Tested: 145 km/h (90 mph)
Power output 2,600 hp (1,900 kW)/
2,430 hp (1,810 kW)
Tractive effort 28,200 kgf (276,548 N; 62,170 lbf)
Operators Indian Railways
Numbers 18000-039, 18080-18111
Locale Northern Railway
Withdrawn 2001
Preserved 2 (18001, 18086)
Disposition Withdrawn

The class WDM-4 is the fourth class of India's wide-gauge (W), diesel-fueled (D) and mixed-load (M) series, capable of hauling both freight and passenger trains. Despite the classification, it was never seen hauling freight trains. It is not known as to why IR decided to allot 4th class instead of 3rd as there was no WDM-3 at the time. This was India's first EMD locomotive, designated as GT16. [2] These were the fastest locomotives in India till the arrival of WAP-3. It does not come under the standard diesel classification system of IR. Similar to WDM-2, it could only haul 9 coaches. So for 18 coach Rajdhani Express, there used to be 2 locos of this class. One of them 18001, is preserved at National Rail Museum, Delhi. The gap in road numbers is due to the units delivered in Pakistan. 18004, 18022, 18098 and 18107 were purchased by IRCON International and sent to Bangladesh for construction work. These were withdrawn due to overageing. These in the end hauled passengers on Dehradun - Moradabad - Lucknow - Varanasi - Mughalsarai - Buxar - Patna - Howrah sections.[3]

Technical specifications

Hauling capacity 2,400 tonnes (2,400 long tons; 2,600 short tons) t
Governor Woodwards

Trains hauled by WDM-4

Sheds Holding WDM-4


The very first unit 18001 is preserved at National Rail Museum and another unit from the second batch 18086 is preserved plinthed at Lucknow (Alambagh) Diesel Locoshed.

See also


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