British Rail Class 97/6

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British Rail class 97/6
24.07.82 Radyr Yard 97651 (6001161649).jpg
97651 at Radyr in August 1982.
Type and origin
Power typeDiesel-electric
Builder Ruston & Hornsby
Serial number312990, 431758–431761
Build date1953 (650), 1959 (651-654)
Total produced5
Specifications
Configuration:
   Whyte 0-6-0
   UIC C
Gauge 4 ft 8+12 in (1,435 mm) standard gauge
Wheel diameter97650: 3 ft 2+12 in (0.978 m)
97651-97654: 3 ft 4 in (1.016 m)
Length24 ft 8+12 in (7.53 m)
Width8 ft 6 in (2.59 m)
Height11 ft 0 in (3.35 m)
Loco weight97650: 28 long tons (28 t; 31 short tons)
97651-97654: 30 long tons (30 t)
Prime mover Ruston 6VPHL
RPM range1,250 rpm (max)
Generator BTH RTB6034
Traction motors BTH RTA5041 (nose-suspended), 1 off
Loco brake Straight air
Train brakes 97650: none, later vacuum
97651–97654: vacuum
Performance figures
Maximum speed20 mph (32 km/h)
Power output165 hp (123 kW)
Tractive effort 17,000  lbf (75.6  kN)
Career
OperatorsBritish Railways’ Western Region Chief Civil Engineer's department
NumbersPWM 650–654 later 97650–97654
Axle load class RA 1
Disposition3 preserved, 2 scrapped

The British Rail Class 97/6 0-6-0 diesel shunting locomotives were purpose-built for departmental duties by Ruston & Hornsby at Lincoln in 1953 (97650) or 1959 (97651-654). There are minor technical differences between 97650 and the 1959 batch.

Contents

This class of five locomotives is outwardly similar to the Class 04 diesels built around the same time, but internally they are quite different. The Class 97/6 is diesel-electric, while the Class 04 is diesel-mechanical.

The Class 97/6 is related to the older British Rail Class D1/3, which was a 0-4-0 diesel-mechanical version of the Ruston & Hornsby 165DE.

Overview

PWM651 at Radyr, c. 1977. 5182373440 PWM.jpg
PWM651 at Radyr, c. 1977.
97650 at Worcester Shrub Hill in 1979 - this loco was different from the others. Worcester Shbur Hill train (cropped).jpg
97650 at Worcester Shrub Hill in 1979 - this loco was different from the others.

The fleet was originally numbered PWM650-654 in the Western Region Permanent Way Machines series, hence were commonly referred to as the “PWM shunters” or simply “PWMs”. [1] Between 1979 and 1981 they were renumbered as Class 97 locomotives. Originally painted in BR Green livery, this was later superseded by BR Blue and finally Civil Engineering Yellow. They were employed at various locations, including Reading West (97650/653/654), Gloucester / Cardiff Canton / Radyr (97651) and Plymouth Laira (97652).

Specification

A notable feature of this class is that the electric traction motor can be disengaged from the wheels. This allows the locomotive to be hauled by another locomotive at speeds above 20 mph.

Withdrawal

With the privatisation of British Rail in the mid-1990s, these locomotives were largely made redundant. Three locomotives had already been withdrawn from traffic, and only nos. 97651 and 97654 survived long enough to pass into English Welsh & Scottish (EWS) ownership. Number 97654 was sold to an infrastructure company based in Edinburgh, and remained in use until 2005, when it was preserved. Number 97651 was one of the first locomotives sold by EWS into preservation.

Preservation

97651 as preserved. Rail-97651-amoswolfe.jpg
97651 as preserved.

Three of the five locomotives have been preserved on heritage railways.

Incomplete remains of 97653 were stored at the former Ministry of Defence depot at Long Marston, Warwickshire until taken to Hurst's, Andover for scrap in August 2011. [2]

Fleet details

Key:PreservedScrapped


Number(s)BuiltFinal liveryWithdrawnDisposalNotes
97650PWM6501953BR Blue1987Preserved
97651PWM6511959CE Yellow1996Preserved - Swindon and Cricklade Railway
97652PWM6521959CE Yellow1987Scrapped (1990)
97653PWM6531959CE Yellow1993Scrapped (2011)
97654PWM6541959CE Yellow2005Preserved

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References

  1. Booth, A. J. (1992). The PWM's: A History of the BR Western Region class 97/6 Departmental Shunters. Bridlington: Industrial Railway Society. ISBN   0901096741.
  2. "Please login".

Sources