19 July 2009

Pacific Type Locomotives

The metre (1000 mm) gauge Malayan Railway was amongst the earliest railways in Asia to adopt the Pacific type locomotives, sixty engines of the Class H being built between 1907 - 1914. With a small volume of highly rated freight traffic it was possible to adopt standard engines for both passenger and freight services. Three coupled axles were enough to move the trains at moderate speeds over the whole Malayan rail network.

As a result of experience gained with subsequent classes of Pacific type locomotives the final design of Malayan Pacific locomotives was designed and 68 engines being eventually built. They had bar frames, steel fireboxes and the three cylinders 13"x24" (330x610 mm). Driving wheels had 54" diameter (1372 mm). Heating surface of the boiler was 1.109 sq ft (0.1030 m2) of which 218 sq ft (20.3 m2) was superheating surface. Grate area was 27 sq ft (2.5 m2).

Total weight in working order was 60.5 tons. Maximum axle load was 12.9 tons. Maximum speed in ordinary service was 50 mph (80 km/h). Three cylinders were provided with rotary cam poppet valves, the camshaft being divided to two parts, independently driven from each side of the engine. This avoided complete immobilization in case of breakdown on a long stretch of single track. These locomotives were all converted to burn oil fuel. During World War II , after the fall of Singapore the Japanese Southern Army Railway Engineering Troops transferred a number of older Malayan Pacifics to operate their 471 km (292.7 miles) Taimen Rensetsu Tetsudo, the Thailand - Burma Railway.

Some Pacifics were not returned to Malaya after the war but stayed in Thailand. When the rail connection was provided between Malayan and Siamese railways the Pacifics were common sight at the head of "Singapore" and "Bangkok" expresses as well as on the other passenger trains in domestic Malayan service. After the arrival of the main line diesel electric locomotives in the latter part of the 1950 the Pacifics lost all important trains and were transferred to less important trains. Many survived up the end of Malayan steam traction in 1970s.

Builder details:
  • H1 72 - 78 2C1-n2 15 1/2"x24" 54" Kitson 4425 - 4432 / 1906
  • H1 79 - 82 2C1-n2 15 1/2"x24" 54" Nasmyth Wilson 839 - 842 / 1908
  • H1 88 - 98 2C1-n2 15 1/2"x24" 54" Kitson 4569 - 4579 / 1908
  • H2 103 - 106 2C1-n2 15 1/2"x24" 54" Kitson 4835 - 4838 / 1911
  • H2 107 - 112 2C1-n2 15 1/2"x24" 54" Kitson 4866 - 4871 / 1912
  • H2 115 - 117 2C1-n2 15 1/2"x24" 54" Kitson 4875 - 4877 / 1912
  • H2 118 - 121 2C1-n2 15 1/2"x24" 54" Stephenson 3502 - 3505 / 1913
  • H2 131 - 134 2C1-n2 15 1/2"x24" 54" Nasmyth Wilson 833 - 836 / 1908
  • H2 135 - 140 2C1-n2 15 1/2"x24" 54" Kitson 4955 - 4959 / 1913
  • H2 141 - 144 2C1-n2 15 1/2"x24" 54" Kitson 4960 - 4963 / 1913
  • H3 162 - 166 2C1-n2 15 1/2"x24" 54" Kitson 5015 - 5019 / 1914
  • I1 182 - 185 2C1-h2 15 1/2"x24" 54" Kitson 5159 - 5162 / 1918
  • I1 186 - 201 2C1-h2 15 1/2"x24" 54" North British Locomotive 22505 - 22520 / 1919
  • Q1 202 - 207 2C1-h2 15 1/2"x24" 54" Baldwin 51914 - 51957 / 1920
  • Q1 208 - 209 2C1-h2 15 1/2"x24" 54" Baldwin 51991 - 51992 / 1920
  • Q1 210 - 213 2C1-h2 15 1/2"x24" 54" Baldwin 52018 - 52021 / 1920
  • L1 214 - 233 2C1-h2 15 1/2"x24" 54" Kitson 5300 - 5319 / 1921 -> 531.01-20
  • K1 153" - 159" 2C1-h2 17"x24" 54 Beyer Peacock 6373 - 6379 / 1927 -> 541.01-07
  • K2 151" - 152" 2C1-h2 17"x24" 54 Stephenson 4013 - 4014 / 1927 -> 542.01-02
  • K2 160" - 161" 2C1-h2 17"x24" 54 Stephenson 4015 - 4016 / 1927 -> 542.03-04
  • S1 237 - 239 2C1-h3 (3)17"x24" 54" North British Locomotive 23679 - 23681 / 1928 -> 551.01-03
  • S2 240 - 247 2C1-h3 (3)17"x24" 54" North British Locomotive 23904 - 23911 / 1929 -> 552.01-08
  • S3 248 - 252 2C1-h3 (3)17"x24" 54" Beyer Peacock 6721 - 6725 / 1931 -> 553.01-05
  • O1 60" - 70" 2C1-h3 (3)12 1/2"x24" 54" North British Locomotive 24419 - 24429 / 1938 -> 561.01-11
  • O2 71" - 76" 2C1-h3 (3)12 1/2"x24" 54" North British Locomotive 25508 - 24513 / 1939 -> 562.01-06
  • O3 77" - 80" 2C1-h3 (3)13"x24" 54" North British Locomotive 24570 - 24573 / 1939 -> 563.01-03
  • O3 81" - 87" 2C1-h3 (3)13"x24" 54" North British Locomotive 24574 - 24580 / 1940 -> 563.04-11
  • O4 564.01 - 564.40 (3)13"x24" 54" North British Locomotive 25756 - 27595 / 1946

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