DeRoI-class locomotive (Toshiba)

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Chosen Government Railway DeRoI class (デロイ)
Korean State Railway Chŏngiha class (전기하)
Builder's photo of DeRoI-1
Type and origin
Power typeElectric
DesignerShinichi Matsuda, Saneyoshi Hirota
BuilderKisha Seizō, Toshiba
Build date1943–1944, 1947–1949
Specifications
Configuration:
​
 • UIC1C-C1
Gauge1,435 mm (4 ft 8+1⁄2 in)
Wheel diameter1,370 mm (54 in)
Trailing dia.860 mm (34 in)
Wheelbase:​
 • Axle spacing
(Asymmetrical)		1-2: 2,050 mm (6 ft 9 in)
2-3: 1,880 mm (6 ft 2 in)
3-4: 2,600 mm (8 ft 6 in)
Pivot centres9,780 mm (32 ft 1 in)
Length:
​
 • Over body16,000 mm (52 ft 6 in)
Width3,100 mm (10 ft 2 in)
Height:
​
 • Pantograph4,550 mm (14 ft 11 in)
 • Body height4,050 mm (13 ft 3 in)
Adhesive weight108 t (238,000 lb)
Loco weight135 t (298,000 lb)
Electric system/s3,000 V DC
Current pickup(s)Pantographs
Generator1x MG1
Traction motors6x MT1 ​
 • Continuous385 kW (516 hp)
Gear ratio19:78=1:4.11
Loco brakeEL14AR Regenerative
Train brakesElnar air brake, hand brake
Compressor2x MC1 1,700 L (450 US gal)/min
CouplersAAR knuckle
Performance figures
Maximum speed75 km/h (47 mph)
Power output2.31 MW (3,100 hp)
Tractive effort195.72 kN (44,000 lbf)
Career
OperatorsChosen Government Railway
Korean State Railway
ClassCGR: デロイ DeRoI
KSR: 전기하 Chŏngiha
Number in class9
NumbersCGR: デロイ1 - デロイ9
KSR: 전기하1 - 전기하9

The Toshiba DeRoI-class (Japanese: デロイ) was a group of nine boxcab-style electric locomotives with regenerative braking (type EL14AR[1]) and the capability for multiple-unit control manufactured by built by Toshiba in 1943–1944.[2] They were very similar to the Mitsubishi-built DeRoI-class locomotives and the DeRoNi-class locomotives built by Hitachi. They were built for the Chosen Government Railway (Sentetsu), and after the partition of Korea were inherited by the Korean State Railway of North Korea, where they were known as the Chŏngiha (Korean: 전기하, "Electric 1") class.[3]

Description[edit]

The first electrified railway in Korea was the 29.7 km (18.5 mi) 1,067 mm (42.0 in) narrow gauge streetcar line in Seoul running from Seodaemun to Cheongnyang-ni via Cheongno and Dongdaemun, which was opened on 18 April 1898 by the Hanseong Electric Company. This was actually the first railway of any type in Korea, having preceded the 33.2 km (20.6 mi) Gyeongin Railway from Noryangjin to Jemulpo, which opened on 18 September 1899. The first electrified standard gauge mainline railway in Korea was the privately owned Geumgangsan Electric Railway, which on 1 August 1924 opened a 28.8 km (17.9 mi) line from Cheorwon to Geumhwa electrified at 1,500 V DC. Later, the line was extended from Cheorwon to Naegeumgang; the 116.6 km (72.5 mi) extension was opened on 1 July 1931.[4]

The Government-General of Korea began working on a national electric power policy in November 1926, and the resulting plan was completed in December 1931. Chapter 4, "Utilising Electricity in Transportation in Korea" dealt with the electrification of Korea's railways. In 1937, a plan to electrify the Bokgye–Gosan section of the Gyeongwon Line, the Jecheon–Punggi section of the Gyeonggyeong Line and the Gyeongseong–Incheon Gyeongin Line was submitted to the Imperial Diet, which approved it in 1940.[4] Sentetsu issued its requirement for an electric locomotive in 1938, beginning discussions with Mitsubishi in that year regarding the implementation of the electrification plan. Part of the Railway Bureau's goal with the electrification plan was to set a new world speed record, and to go with that, a state-of-the-art locomotive was desired. The project entailed many Japanese firsts, including the first use of 3,000 V electrification, and, specific to the DeRoI class locomotive, the first use of regenerative brakes.[5][4] The resulting design was very similar to the EF12 class of the Japanese National Railways.

When the electrification of rail lines in Korea was begun in 1943, Sentetsu ordered twenty DeRoI class locomotives of 135 tons - sixteen from Toshiba[6] and four from Mitsubishi.[5] The original class name, デロイ (DeRoI), comes from the Sentetsu classification system for electric locomotives: DeRoI = De, for "electric" (from 電気, denki), Ro, to indicate six powered axles (from Japanese roku, 6), and I (from Japanese ichi, 1), indicating the first class of electric locomotive with six powered axles.[7]

Though generally quite similar in appearance to the Hitachi-built DeRoNi class and the Mitsubishi-built versions of the DeRoI class, there were a number of features that distinguished the Toshiba-built DeRoI class from the others. These were: unequal spacing of side windows; a distinctive ventilator shape; and a distinctive arrangement of the deck railings.[8]

Although the major design work of the type was undertaken by Mitsubishi, the first DeRoI-type locomotives delivered to Sentetsu were those built by Toshiba; the first four were built by Kisha Seizō using Toshiba electrical components.[9] DeRoI-1 arrived at Busan in December 1943, where it was assembled at Sentetsu's Busan works before being sent to Gyeongseong, where it was displayed for the public. As none of the planned electrification of Sentetsu lines had been completed yet, the first tests were carried out at Cheorwon Station, under the 1,500 V electrification of the Geumgangsan Electric Railway.[4] The sixteen units ordered from Toshiba were intended for use on the Kyŏngwŏn Line; however, only five had been delivered by the end of the Pacific War - numbers 1 through 3 were built in 1943 (June, August and December respectively), numbers 4 and 5 in 1944 (January and October.[10]

Although the Gyeonggyeong Line electrification was to have been the first to be undertaken, it was the Bokgye–Gosan section of the Gyeongwon Line where the first electrification was actually completed, in 1944. After a test of the 2,000 kW mercury rectifier transformer was carried out on 13 February, the first test trains were run on 27 and 28 March. Operation of revenue trains on the Bokgye–Gosan section was switched from steam to electric traction on 1 April 1944.[4]

At the time of the partition of Korea after the end of the Pacific War, of the five Toshiba-built DeRoI class locomotives, four were in the North and one was in the South, in Seoul for repairs.[6] After the partition, the Allied General Headquarters (GHQ) in Tokyo ordered the delivery of three Mitsubishi-built and seven Toshiba-built DeRoI class locomotives to Korea as reparations; these were all delivered to the South.[11] DeRoI 6 had been completed in November 1944 and taken to the port at Kobe, Japan, for delivery, but was subsequently returned to the factory; this became the first of the ten new locomotives to be delivered to Korea, in March 1946. Numbers 7 through 9 were built and delivered in 1947 (January, June and September respectively), while the last three, numbers 10 through 12, were completed in 1949; however, after the outbreak of the Korean War and the destruction of the (incomplete) electrification in the south, these three units were scrapped in Japan, never having been delivered.[10] Of the locomotives delivered after the partition, all but one were eventually captured by the North Korean army and taken to the North; the eighth unit had been in storage at Pusan, and was scrapped in 1958 without ever having been used. Thus of the 16 units actually built, 15 ended up in the North.[6]

Plans were made for Toshiba to build some DeRoI class locomotives for the Soviet Union as war reparations, but due to the escalation of the Cold War after 1949, these were never built.[10]

As the Korean War caused the destruction of the electrification of North Korea's rail lines, they sat disused until 1956. In that year they were reclassified Chŏngiha (전기하) class and numbered 전기하1 through 전기하9, and were refurbished at the engine shops at Yangdŏk for use on the Yangdŏk-Ch'ŏnsŏng section of the P'yŏngra Line, which had been electrified in 1956 as the first stage of North Korea's electrification plans.[12]

Originally painted brown, they were repainted in 1958-59 in the light blue over dark green livery to match the scheme that was made standard with the introduction of the Red Flag 1 class electric locomotives.[7][3] At some point, the original pantographs were replaced with pantographs of the type used on the Red Flag 1 class locomotives.[13]

As of 2011 at least one, Chŏngiha 3, is still operational, based at Kowŏn.[13] This unit was inspected by Kim Il Sung[13] and, as such, it is kept in a pristine state as a "historic monument of the Revolution".

Construction[edit]

Original Postwar
Owner Number Builder Year Works no. Owner Number Notes
CGR デロイ1 Kisha Seizō 1943.6 2681 KSR 전기하1
CGR デロイ2 Kisha Seizō 1943.8 2682 KSR 전기하2
CGR デロイ3 Kisha Seizō 1943.12 2683 KSR 전기하3 Still in service as historical locomotive
CGR デロイ4 Kisha Seizō 1944.1 2684 KSR 전기하4
CGR デロイ5 Toshiba 1944.10 KSR 전기하5
CGR デロイ6 Toshiba 1944.11 KNR 데로1-6 Delivered 1947. Captured during Korean War → KSR 전기하6
KNR 데로1-7 Toshiba 1947.1 - - Captured during Korean War KSR → KSR 전기하7
KNR 데로1-8 Toshiba 1947.6 - - In storage at Pusan, scrapped 1958
KNR 데로1-9 Toshiba 1947.9 - - Captured during Korean War KSR → KSR 전기하9
KNR 데로1-10 Toshiba 1949 - - Not delivered, scrapped in Japan
KNR 데로1-11 Toshiba 1949 - - Not delivered, scrapped in Japan
KNR 데로1-12 Toshiba 1949 - - Not delivered, scrapped in Japan

Gallery[edit]

  • Electric Locomotive Chŏngiha-3 of the Korean State Railway.
    Electric Locomotive Chŏngiha-3 of the Korean State Railway.
  • Refurbishment of DeRoI and DeRoNi class electrics at Yangdŏk in 1956
    Refurbishment of DeRoI and DeRoNi class electrics at Yangdŏk in 1956
  • Chŏngiha 5 at the ceremony commemorating the completion of the electrification of the Yangdŏk–Sinch'ang section of the P'yŏngwŏn Line in 1948.
    Chŏngiha 5 at the ceremony commemorating the completion of the electrification of the Yangdŏk–Sinch'ang section of the P'yŏngwŏn Line in 1948.

References[edit]

  1. ^ "デロイを探せ！（その50） ソ連向けデロイの輸出許可申請書（その1）". ゴンブロ！（ゴンの徒然日記） (in Japanese). 23 February 2014.
  2. ^ "デロイを探せ！（その2）". ゴンブロ！（ゴンの徒然日記） (in Japanese). 21 October 2011.
  3. ^ a b Hayato, Kokubu, 将軍様の鉄道 (Shōgun-sama no Tetsudō), ISBN 978-4-10-303731-6
  4. ^ a b c d e Byeon, Seong-u (1999). 한국철도차량 100년사 [Korean Railways Rolling Stock Centennial] (in Korean). Seoul: Korea Rolling Stock Technical Corp.
  5. ^ a b "松田新市三菱電機技師の戦中戦後の電気車設計". 北山敏和の鉄道いまむかし (in Japanese).
  6. ^ a b c "デロイを探せ！（その４）発注数量と実生産数". ゴンブロ！（ゴンの徒然日記） (in Japanese). 8 November 2011.
  7. ^ a b "デロイを探せ！（その31） 戦後のデロイ（1964年）". ゴンブロ！（ゴンの徒然日記） (in Japanese). 8 July 2012.
  8. ^ "デロイを探せ！（その21） 北朝鮮に残るデロイは東芝製？". ゴンブロ！（ゴンの徒然日記） (in Japanese). 6 January 2012.
  9. ^ Yamada, Keitarō (1972). 汽車会社蒸気機関車製造史 [Manufacturing History of Kisha Kaisha Steam Locomotives] (in Japanese). Nagoya: Kōyūsha.
  10. ^ a b c "デロイを探せ！（その51）ソ連向けデロイの輸出許可申請書（その2）". ゴンブロ！（ゴンの徒然日記） (in Japanese). 18 March 2014.
  11. ^ "デロイを探せ！（その15） デロイ戦後の遍歴3". ゴンブロ！（ゴンの徒然日記） (in Japanese). 11 December 2011.
  12. ^ "デロイを探せ！（その22） 北朝鮮のデロイ資料2（交通新聞1956年）". ゴンブロ！（ゴンの徒然日記） (in Japanese). 12 January 2012.
  13. ^ a b c "デロイを探せ！（その20） 北朝鮮のデロイ資料1". ゴンブロ！（ゴンの徒然日記）. 27 December 2011.
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