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Indian WP
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works (116)
Canadian Locomotive Company (200)
Montreal Locomotive Works (120)
Fabryka Lokomotyw, (30)
Lokomotivfabrik Floridsdorf (30)
Chittaranjan Locomotive Works (259)
Build date1947–1967
Total produced755
Specifications
Configuration:
• Whyte4-6-2
• UIC2′C1′ h2
Gauge5 ft 6 in (1,676 mm)
Leading dia.3 ft 7 in (1.092 m)
Driver dia.5 ft 7 in (1.702 m)
Trailing dia.3 ft 7 in (1.092 m)
Length77 ft 538 in (23.61 m) over buffers
Axle load18.5 long tons (18.8 t; 20.7 short tons)
Loco weight101.5 long tons (103.1 t; 113.7 short tons)
Tender weight72.0 long tons (73.2 t; 80.6 short tons)
Fuel typeCoal
Fuel capacity15 long tons (15 t; 17 short tons)
Water cap5,500 imp gal (25,000 l; 6,600 US gal)
Firebox:
• Firegrate area
46 sq ft (4.3 m2)
Boiler pressure210 psi (1.45 MPa)
Heating surface2,920 sq ft (271 m2)
CylindersTwo, outside
Cylinder size2014 in × 28 in (514 mm × 711 mm)
Valve gearWalschaerts
Valve type12 in (305 mm) piston valves
Valve travel712 in (191 mm)
Performance figures
Power output2,680 hp (1,998 kW) drawbar (est.) at 74 mph (119 km/h)
Tractive effort30,600 lbf (136.12 kN)
Career
Numbers7000–7754
DispositionNine preserved, remainder scrapped

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The Indian locomotive class WP was a class of 4-6-2 'Pacific' steam locomotives used in India. It was introduced after World War II for passenger duties, marking the change from 'X' to 'W' as the classification code for broad gauge locomotives.

The class was designed specifically for low-calorie, high-ash Indian coal, by Railway Board designers in India.

WP class locomotives were capable of doing up to 110 km/h (68 mph) and were easily recognized by their cone-shaped bulging nose, usually with a silver star device painted on it.

History[edit]

WP/P class 7200 by Baldwin from 1947, at the National Rail Museum, New Delhi (1993)

A total of 755 WPs were built between 1947 and 1967, bearing fleet numbers 7000 to 7754. The first batch of sixteen, numbers 7200–7215, came from the Baldwin Locomotive Works, USA in 1947, and these were classed WP/P. (P for Prototype).

A main production batch of 300 locomotives followed in 1949, with production split between Baldwin (100), Montreal Locomotive Works (120), and Canadian Locomotive Company (80). The locomotives in this group were numbered 7216–7515, but the running numbers were issued in blocks as the locomotives were issued to the pre-nationalisation companies, and so bore no relation to the manufacturers' serial numbers, or even the manufacturer.[1]

A further 180 locomotives were built between 1955 and 1959, with production split between Canadian Locomotive Company (120), Fabryka Lokomotyw, of Chrzanów, Poland (30), and Lokomotivfabrik Floridsdorf of Vienna, Austria (30).

Between 1963 and 1966, 259 more were built, but these were ordered from Chittaranjan Locomotive Works (CLW), and were manufactured in India, and classified WP/I.[1] The WP/Is were 5 tonnes heavier.[citation needed]

The WP was Indian railways' crack locomotive in the 1960s and 1970s. Before the widespread introduction of diesel and electric locomotives several prestigious trains, such as the Taj Express, the Grand Trunk Express, Howrah-Madras Mail, Frontier Mail and the AirConditioned Express were once hauled by WP class locomotives.

The entire WP class remained intact into the 1980s. Some WPs remained in service until the 1990s, and nine have been preserved. One constructed by Baldwin (7200) in 1947 and the other by Fablok in 1959 are a part of the collection of the National Rail Museum, New Delhi.[2]

WP7200 received a full heavy overhaul at Amritsar works in April 2015 and is now kept at Rewari shed near New Delhi for excursion service. Apart from 7200, the remaining eight engines include (7278) constructed by Montreal Locomotive Works and preserved at Charbagh Loco Works, (7581) built by Canadian Locomotive Company is preserved at Sonepur DRM, (7656) built by Chittaranjan Locomotive Works is preserved at Jhansi Institute Railway, (7000) built by Fabryka Lokomotyw or in Charznow Poland is preserved in Bhusaval shed, (7411) however its builder as of 2019 has yet to be identified and it is unclear as to whether (7411) was built by Baldwin, Canadian Builders, Montreal, Fabryka, Lokomotivfabrik Floridsdorf, or Chittaranjan itself, as the builders plate for (7411) was not identified, the engine is preserved in Burdwan and awaiting transfer to the Chennai Museum however currently there are no wheels on its tender, (7015) built by Fabryka Lokomotyw or Charznow Poland is another Polish preserved WP engine and has been restored to full mainline running order and runs mainline heritage excursion special trains, being preserved at Rewari shed, (7161) is another locomotive built by Chittaranjan which has been fully restored to full working order on mainline excursions, (7161) being preserved at Siliguri.

Technical specifications[edit]

  • Boiler: 5 ft 11 in (1.80 m) diameter[citation needed]
  • Heating Surface: 3,082 sq ft (286.3 m2)[citation needed]
  • Maximum Train Load: 680 tonnes[citation needed]

Class table[edit]

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Table of orders and numbers
YearManufacturerSerial Nos.QtyFirst Nos.All-India Nos.Notes
1947Baldwin73408–73423167200–7215Prototypes
1949Baldwin74294–743931001–100In range 7216–7515
1949Canadian2544–262380C251–C330In range 7216–7515
1949Montreal77200–77259
77345–74399
77576–77580
120M1–M120In range 7216–7515
1955–56Canadian2730–28491207516–7635
1958–59Fablok4997–5006
5031–5050
303000–30297000–7029
1957Floridsdorf17827–17856303030–30597030–7059
1963Chittaranjan367060–7095
1963–64Chittaranjan507096–7145
1964–65Chittaranjan337146–7178
1965Chittaranjan737179–7199
7636–7687
1966Chittaranjan377688–7724
1966Chittaranjan307725–7754

See also[edit]

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References[edit]

Notes[edit]

  1. ^ abHughes 1996, p. 16.
  2. ^'Archived copy'. Archived from the original on 2016-03-03. Retrieved 2014-05-27.CS1 maint: archived copy as title (link)
India

Bibliography[edit]

  • Hughes, Hugh (1976). Steam in India. Truro, Cornwall: D. Bradford Barton Ltd. ISBN0851532586.
  • Hughes, Hugh (1996). Indian Locomotives: Part 4 – 1941–1990. Harrow, Middlesex: The Continental Railway Circle. ISBN0-9521655-1-1.
  • Marshall, Lawrence G (2009). Indian Broad Gauge Steam Remembered. East Harling, Norfolk: Taverner Publications. ISBN9781901470154.

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External links[edit]

Wikimedia Commons has media related to Indian locomotive class WP.

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