Sri Lanka Railways Class W1
Class W1 No. 663
Type and origin
Power typeDiesel
BuilderRheinstahl Henschel
ModelDHG-1200 [1]
Build date1969
Total produced45
RebuilderSri Lanka Railways
Specifications
Configuration:
​
 • AARB-B
Gauge1,676 mm (5 ft 6 in)
Length12.8 metres (41 ft 11+7⁄8 in)[2]
Loco weight60.5 t (59.5 long tons; 66.7 short tons)
Prime moverPaxman 12YJXL[1]
RPM range1500
Engine typeV12 4 stroke diesel[1]
TransmissionVoith L 520 R U2 [3]
Train brakesVacuum
Performance figures
Maximum speed80 km/h (50 mph)
Power output1,150 hp (860 kW)
Career
OperatorsSri Lanka Railways
ClassW1
Number in class45
LocaleSri Lanka
Delivered1969
Retired1995
10 locomotives from W1 class were later fitted with new engines and renumbered as W3 class.

The Sri Lanka Railways Class W1 is a class of Sri Lankan diesel hydraulic locomotive that was built by Rheinstahl Henschel in 1969. A total of 45 W1s were built and imported. This is the first diesel-hydraulic locomotive which ran on Sri Lankan rail.

Origins

The history of W1 begins in 1969. 45 of W1s were imported to Sri Lanka which made W1 the most numerous class of SLR locomotives that time. At that time only Class M1 and Class M2 locomotives were in operation. Most of other services were carried out by steam locomotives. But with the introduction of W1s most of steam locomotives were taken out of service and those services were taken by W1. These locomotives have been used for Upcountry trains Udarata Menike and Podi Menike for about 25 years until 1995, along with the M6. Also, this locomotive can be operated on any of railway lines in Sri Lanka.[2]

Decline

By 90's most of W1s were out of service all because of problems in the prime-mover and some due to serious accident damages. These condemned locomotives were scrapped.[2]

In Service

With declination of W1s 2 locomotives (650 & 657) were fitted with new Paxman VEGA SE/RP 160[1] prime movers of power 1250 HP. By 2011 only 2 of them were in running condition. Those were used in light duties. By 2012 none of W1s were in operation. Note - 657 was a yard shunter at Dematagoda in 2016. On 18 Aug 2016 it took the rerailing van from Dematagoda sheds to Colombo's Fort station to rerail a coach of an arriving train. The coach's rear bogie had become derailed on the points serving platforms 1 and 2. It then returned with the rerailing van to Dematagoda. Eric Hayman travelled in from Dematagoda on 657 and saw the whole operation. He returned on the loco to the sheds.

Class W3

Class W3
Sri Lanka Railways Class W3
W3 No. 673
Type and origin
Power typeDiesel
ModelDH3 1200
RebuilderSri Lanka Railways, Adtranz
Rebuild date1997
Number rebuilt10
Specifications
Configuration:
​
 • AARB-B
Gauge1,676 mm (5 ft 6 in)
Prime moverCaterpillar 3512 DI-TA [2]
TransmissionVoith L 520 R U2
MU workingYes
Loco brakeAir, Hydro-Dynamic
Train brakesAir, Vacuum
Performance figures
Power output1,200 hp (890 kW)
Career
DispositionActive
No. 631, 636, 638, 647, 659, 665, 666, 667, 669 and 673 W1 locomotives were reclassified as W3.

In 1997, 10 Class W1 locomotives were extensively refurbished. SLR and Adtranz involved in this. During these refurbishment the locomotives were fitted with new power plants, power transmission systems and electronic engine control systems. As well as a full new repaint of Blue and Silver was undertaken.

After the extensive refurbishment, the locomotives were reclassified as the W3-class.

See also

References

  1. 1 2 3 4 "Class W1". Sri Lanka Railways Info Page. 19 September 2012. Retrieved 18 November 2013.
  2. 1 2 3 4 "෴W1 දුම්රිය එන්ජිම - ශ්‍රී ලංකාවට ගෙනා මුල්ම ඩීසල් හයිඩ්‍රොලික් වර්ගයේ දුම්රිය එන්ජිම෴". Loco Lanka. 5 March 2011. Retrieved 18 November 2013.
  3. ↑ "W Class Locomotives – W1". Archived from the original on 29 October 2013. Retrieved 9 July 2023.{{cite web}}: CS1 maint: unfit URL (link)
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