Dolgoch (locomotive)

Dolgoch
Dolgoch at Tywyn Wharf in 2024
Type and origin
Power typeSteam
BuilderFletcher, Jennings & Co.
Serial number63[1]
ModelClass Bb
Build date1866[1]
Total produced1
Specifications
Configuration:
​
 • Whyte0-4-0WT
Gauge2 ft 3 in (686 mm)
Driver dia.2 ft 4 in (711 mm)[1]
Wheelbase6 ft 6 in (1.98 m)[1]
Length17 ft 5 in (5.31 m)[1]
Loco weight10 long tons 5 hundredweight (11.5 short tons; 10.4 t)[1]
Boiler pressure150 lbf/in2 (1.03 MPa)[1]
CylindersTwo, outside
Cylinder size7+5⁄8 in × 16 in (194 mm × 406 mm)[1]
Performance figures
Tractive effort4,236 lbf (18.84 kN)[1]
Career
OperatorsTalyllyn Railway
Numbers2
No 2 Dolgoch at Tywyn Wharf station around 1900. The locomotive is carrying the name "Pretoria"
Dolgoch in 1951
Dolgoch in 2021

Dolgoch[a] is a narrow gauge 0-4-0 well tank steam locomotive. It was built by Fletcher, Jennings & Co. and is one of the oldest locomotives still in active service. It was delivered to the Talyllyn Railway in 1866[2][page needed] and continues to run on this railway to this day.

Dolgoch holds an important place in railway preservation history as it was the only serviceable locomotive on the Talyllyn Railway when it became the first preserved railway to be operated by volunteers, in 1951. Dolgoch kept the railway going during this first season.[3][page needed]

Design

The design is unusual for an 0-4-0. It has a long wheelbase and the driving axle is behind the firebox in a layout similar to a Crampton locomotive.[4] This prevents the use of a conventional valve gear layout which is driven from the rear axle. Instead, the Allan valve gear is driven from the leading coupled axle and doubled back to connect to the valve rods. Dolgoch has two water tanks - the main well tank between the frames and a smaller back tank at the rear of the cab.

History

The locomotive was renamed Pretoria between about 1900 and 1914 in celebration of the relief of the township of Pretoria in South Africa by Lord Roberts during the Boer War. It then reverted to the original name Dolgoch.[2] For most of the Railway's life, names were painted only on the North side of the locomotives. Polished brass nameplates have only been carried in preservation.

In early 1945, Dolgoch was sent to the Atlas Foundry in Shrewsbury to be overhauled. At this time the railway's only other locomotive, Talyllyn, was so worn out it could not be safely operated and services on the railway were suspended. Dolgoch returned to service in September 1945, with new displacement cylinder lubricators mounted on each side of the smokebox, a new chimney, repaired inner firebox and a retubed boiler.[5]

Around 1949, Dolgoch's boiler was patched, and on 26 August 1949, Dolgoch cracked its frame in an accident, which resulted in its driver being dismissed from the company. Dolgoch was the only operable locomotive from 1945 until 1952, when Edward Thomas was restored for use.[5]

Between 1954 and 1963, Dolgoch underwent a major overhaul.[1]

In fiction

The fictional locomotive Rheneas in The Railway Series by the Rev. W. Awdry is based on Dolgoch. [6]

References

  1. ^ /dolgoχ/
  1. ^ a b c d e f g h i j "No. 2 'Dolgoch'". Talyllyn Railway. Archived from the original on 24 October 2018. Retrieved 22 February 2021.
  2. ^ a b Boyd 1988
  3. ^ Rolt 1953
  4. ^ "Tank locomotives for the Talyllyn Railways". Engineering. 27 January 1877.
  5. ^ a b Quine, Dan (March 2015). "Dolgoch, 1945-1950". Talyllyn News. Talyllyn Railway.
  6. ^ "The Awdry Connection". Talyllyn Railway. Retrieved 25 October 2018.

Bibliography

Wikimedia Commons has media related to Dolgoch.
  • Boyd, James I.C. (1988). The Talyllyn Railway. WildSwan Publications. ISBN 0906867460.
  • Rolt, L.T.C. (1953). Railway Adventure. Constable/David and Charles/Pan.