Northern Counties Committee Class WT
Preserved No. 4 at Mallow in May 2006
Type and origin
Power typeSteam
DesignerH. G. Ivatt
BuilderLMS, BR, Derby Works
Build date1946–1950
Total produced18
Specifications
Configuration:
​
 • Whyte2-6-4T
 • UIC1′C2′ht
Gauge5 ft 3 in (1,600 mm)
Leading dia.37 in (0.940 m)
Driver dia.72 in (1.829 m)
Trailing dia.37 in (0.940 m)
Wheelbase37 ft 9 in (11.51 m)
Length46 ft 5+3⁄4 in (14.17 m)
Width9 ft 3 in (2.82 m)
Height13 ft 2 in (4.01 m)
Axle load17.5 long tons (17.8 t; 19.6 short tons)
Adhesive weight52.58 long tons (53.42 t; 58.89 short tons)
Loco weight87 long tons (88 t; 97 short tons)
Fuel typeCoal
Fuel capacity3.5 long tons (3.6 t; 3.9 short tons)
Water cap.2,500 imp gal (11,000 L)
BoilerG8AS
Boiler pressure200 psi (1.38 MPa)
Heating surface1,416.75 sq ft (131.620 m2) ​
 • Tubes1,042 square feet (96.8 m2)
 • Firebox129.75 sq ft (12.054 m2)
Superheater:
​
 • Heating area246 sq ft (22.9 m2)
CylindersTwo (outside)
Cylinder size19 in × 26 in (483 mm × 660 mm)
Valve gearWalschaerts
Loco brakeSteam
Train brakesAutomatic vacuum
Performance figures
Tractive effort22,160 lbf (98.57 kN)
Factor of adh.5.3
Career
Operators
Number in class18
Numbers1-10, 50-57
Nicknames
  • Jeep
  • Mogul tank
Last runApril 1971
PreservedNo. 4
Current ownerRPSI

The NCC Class WT is a class of 2-6-4T steam locomotives built by the Northern Counties Committee's parent company, the London, Midland and Scottish Railway for service in Northern Ireland.

History

No. 6 at Belfast York Road in August 1960
No. 4 on running-in trials at Whitehead in 2015

18 Class WT locomotives were built at Derby Works in England to the design of George Ivatt between 1946 and 1950, numbered 1–10 and 50–57.[1] They were a tank engine version of the NCC Class W moguls.[1] A tank engine did not require turning at termini and the LMS had produced a series of successful 2-6-4Ts. Like the LMS Fairburn 2-6-4T built at the same time, they had a hopper bunker and absence of plating ahead of the cylinders. They were based on the LMS Fowler 2-6-4T by Sir Henry Fowler.[lower-alpha 1]

Their original duties included commuter services on the branch to Larne, operations to Portrush, and some services on the Belfast–Derry line via Coleraine.[1] Following the transfer of lines from Great Northern Railway of Ireland to the Ulster Transport Authority they also seen use over those lines, particularly from Belfast to Dundalk and suburban services to Portadown.[1] There was at least one example of use of an adapted tender to achieve an extended range between water refills.[1]

In December 1962, locomotive No. 50 received a boiler from one of the ex-NCC 2-6-0 tender locomotives, the boiler and firebox being overhauled and repaired at Derby.

In early 1966 and towards the end of their careers, the Class WT locomotives were involved in working notable traffic. This was on spoil trains that transported fill for motorway construction from the Blue Circle cement works at Magheramorne to Greencastle near Belfast. Three trains of twenty hopper wagons each were made up, with a Class WT locomotive at each end. Each train when filled carried 600 long tons (610 t; 670 short tons) of rock and in all, some 7,600 trains had carried 4,250,000 long tons (4,320,000 t; 4,760,000 short tons) of material by the time the contract ended in May 1970.

The last of the Class WT locomotives were officially withdrawn in 1971,[1] the last time one was in traffic being 22 October 1970.[3] This made them the last steam locomotives in mainline operation in the British Isles;[1] Córas Iompair Éireann steam in the Republic of Ireland having ended in 1962 and British Railways steam in Great Britain having finished in 1968.

Preservation

One of these locomotives, No. 4, has been preserved by the Railway Preservation Society of Ireland (RPSI) following its withdrawal.[4] The RPSI operates it on special mainline trains. It is currently operational after an overhaul was completed in June 2015.

No. 4 was one of seven that were converted to have an extended coal bunker in the mid-1960s to extend the range before needing refilling with coal.[1]

No. 58 Project

The RPSI was considering the possibility of building a new member of the class (No.58) to give them a second mainline tank locomotive considering the low availability of turntables on modern day lines. However, a NCC Class W Mogul is being built instead, due to the longer range between coaling and watering allowed by a tender engine.[5]

Technical details

The locomotives were built with many LMS standard features such as a self-cleaning smokebox, rocking firegrate, self-emptying ashpan, side window cab and a simplified footplate together with others which followed NCC practice, such as a water top-feed on a parallel boiler (as opposed to the taper boilers being used by the LMS at the time), Dreadnought type vacuum brake gear, Detroit sight feed cylinder lubricator and a cast number plate.

The locomotives were capable of over 70 miles per hour (110 km/h) and could be expected to use one ton of coal for every 40 miles (64 km).[4]

Notes

  1. ↑ Mitchell describes the Class WT's true ancestry as the Class W mogul, and notes its less common oxymoron nickname of Mogul tanks points to this, though they were more commonly referred as Jeeps from once their operational flexibility became apparent.[2]

References

Footnotes

  1. 1 2 3 4 5 6 7 8 Boocock 2009, p. 88.
  2. ↑ Mitchell 2021, p. 232.
  3. ↑ Scott 2008, p. 142.
  4. 1 2 Champion 1990, p. 15.
  5. ↑ RPSI Newsletter June 2010.

Sources

  • Arnold, R.M. (1973). NCC Saga. Newton Abbot: David & Charles. ISBN 0-7153-5644-5.
  • Boocock, Colin (1 October 2009). Locomotive Compendium Ireland (1st ed.). Hersham: Ian Allan. ISBN 9780711033603. OCLC 423592044.
  • Champion (20 July 1990). "Steam train makes tracks for Sligo". The Sligo Champion. Sligo. p. 15 – via British Newspaper Archive. 1947 No. 4 engine of the London Midland Scottish Northern Counties Committee. Built in Derby, the engine was withdrawn by Northern Ireland railways in 1979 and was purchased by the Railway Preservation Society of Ireland. The engine weights 87 tons, consumes a ton of coal every forty miles and is capable of travelling at over seventy miles per hour
  • Currie, J.R.L. (1974). The Northern Counties Railway, Volume 2: 1903-1972. Newton Abbot: David & Charles. ISBN 0-7153-6530-4.
  • London Midland and Scottish Railway (Northern Counties Committee). Class WT general arrangement drawing. Belfast: LMS (NCC).
  • Mitchell, Walter F. (February 2021). "Moguls and Jeeps — The W and WT class locomotives of the NCC — a design appreciation". Irish Record Railway Society. 29 (204): 224–234.
  • Scott, William T. (2008). Locomotives of the LMS NCC and its predecessors. Newtownards, County Down: Colorprint. ISBN 9781904242840. OCLC 506214865.
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