| BESA class HP |
|---|
 |
|
| Specifications |
|---|
Configuration:
| |
|---|
| • Whyte | 4-6-0 |
|---|
| • UIC | 2′C n2 |
|---|
| Gauge | 1,676 mm (5 ft 6 in) |
|---|
| Leading dia. | 3 ft 7 in (1,092 mm) |
|---|
| Driver dia. | 74 in (1,880 mm) |
|---|
| Wheelbase: | |
|---|
| • Leading | 7 ft 0 in (2,134 mm) |
|---|
| • Coupled | 6 ft 9 in (2,057 mm) |
|---|
| • incl. tender | Variant with 3000 gallon tender: 50 ft 7 1 ⁄ 2 in (15,430 mm) |
|---|
Length:
| |
|---|
| • Over buffers | Variant with 3000 gallon tender: 60 ft 9 3 ⁄ 4 in (18,535 mm) |
|---|
| Width | 9 ft 6 in (2,896 mm) |
|---|
| Height | 13 ft 6 in (4,115 mm) |
|---|
| Axle load | 16.8 long tons (17.1 t) |
|---|
| Service weight | with 3000 gallon tender: 107 t
with 4000 gallon tender: 113 t
with 4500 gallon tender: 126 t |
|---|
| Water cap. | 3,000 or 4,000 or 4,500 imperial gallons (14,000 or 18,000 or 20,000 L; 3,600 or 4,800 or 5,400 US gal) |
|---|
| Firebox: | |
|---|
| • Type | Belpaire |
|---|
| • Grate area | 32 sq ft (3.0 m2) |
|---|
| Boiler pressure | 180 psi (12.4 bar; 12.7 kgf/cm2) |
|---|
| Heating surface: | |
|---|
| • Tubes | 1,880 sq ft (175 m2) |
|---|
| • Total surface | 2,037 sq ft (189.2 m2) |
|---|
| Cylinders | Two, outside |
|---|
| Cylinder size | 20 in × 26 in (508 mm × 660 mm) |
|---|
| Valve gear | Walschaerts |
|---|
| Valve type | Slide (HP class)
Piston (HPS/HPC class) |
|---|
|
| Performance figures |
|---|
| Tractive effort | Starting: - 11.2 bar boiler pressure: 101 kN (23,000 lbf)
- 9.3 bar boiler pressure: 84 kN (19,000 lbf)
|
|---|
|
| Career |
|---|
| Operators | |
|---|
| Locale | British Raj (until 1947)
India (from 1947)
Pakistan (from 1947)
Bangladesh (from 1971) |
|---|
| Retired | 1980s-early 1990s |
|---|
| Preserved | 2 (India)
1 (Bangladesh) |
|---|
| Disposition | Three preserved, remainder scrapped |
|---|
|
The Class HP (Heavy Passenger) was a broad gauge steam locomotive introduced in 1906 for heavy passenger trains on the railways in British India. It was one of the BESA locomotives developed by the British Engineering Standards Committee, later called the British Engineering Standards Association (BESA).
History
The HP class was the locomotive intended for heavy passenger traffic, which was first proposed in the BESA standard of 1907.[1] Like the AP class, the HP was offered with three different large tenders, the small one holding 3000 gallons of water, the medium 4000 and the large 4500.
The HP class locomotives were delivered to various railways, but only the Indian States Railways (ISR) gave their locomotives the designation HP. They were built by several British locomotive factories, including the Vulcan Foundry, Robert Stephenson and Company, North British Locomotive Company, Kitson and Company and William Beardmore and Company.[2]
Later, the HPS series was introduced, fitted with the Schmidt smoke tube superheater system - the S stands for superheated, and the HPC series for the locomotives with superheaters converted from the HP series, where the C stands for converted.
-
Variant with 3000 gallon tender
-
Variant with 4000 gallon tender
-
Variant with 4500 gallon tender
Preservation
Three HPS series locomotives have been preserved:
| Working | Class | Number | Location | Built | Zone | Builders | Build No | Name |
| No | HPS | 30 | Rajshahi Railway HQ | | | | | |
| No | HPS | 32 | Regional Rail Museum Howrah | | ER | | | |
| No | HPS | 24467 | National Rail Museum | 1950 | RB | Vulcan Foundry Ltd, Newton Le Willows | | |
Technical aspects
The locomotive was a two-cylinder saturated steam engine with a Belpaire firebox . The grate was arranged between the coupling gear sets, for which the wheel base between axles 2 and 3 was increased. The cylinders were arranged on the outside and the drive was on the second axle. The saturated HP class had Walschaerts valve gear with slide valves; piston valves were used in the superheated HPS and HPC classes. The running plate was set low, so splashers had to be fitted above the driving wheels. As with the AP class locomotives, the line of the driver's cab floor is raised in an arc to the height of the running plate. A small cow catcher was attached to the front buffer beam. The driver's cab was completely closed, with the rear wall of the driver's cab being formed by the three-axle tender. The three-axle tender was equipped with running boards and handrails along the side walls, which made it possible to reach the train from the locomotive while in motion.[4]
External links
Wikimedia Commons has media related to Indian locomotive class HP.
References
- ^ "British Designs (1905 -1928)". Development of Steam Locomotive Design in India. Heritage Directorate, Indian Railways. Retrieved 2020-08-22.
- ^ "Great Indian Peninsula 4-6-0 Locomotives in India". steamlocomotive.com. Retrieved 2020-08-31.
- ^ "Preserved Steam Locomotives in Bangladesh". Internationalsteam.co.uk. Retrieved 2017-08-28.
- ^ J. Stuart (1907). "North British Locomotive Company Glasgow (NBL) L294, Indian State Railway (ISR)-East Bengal Railway 234" (in German). Retrieved 2020-08-31.
Variant with 3000 gallon tender
Variant with 4000 gallon tender
Variant with 4500 gallon tender
Preserved superheated HPS variant of the Bangladesh Railway
Preserved superheated HPS variant in the National Rail Museum of India
