D60 steam locomotive
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The Japanese 2-8-4 Berkshire wheel arrangement D60 class of steam locomotives was created by rebuilding an earlier class to suit post-war requirements. In this case, 78 of the successful pre-war 380-strong D50 class of 2-8-2 Mikado locomotives. The D60s were rebuilt between 1951 and 1956 at the JNR Hamamatsu, Nagano, and Tsuchizaki factories. As with the C59 to C60 conversion, an additional trailing axle was included to reduce the heavy axle load of the D50 and allow more widespread use. The cylinder diameter was reduced from 570 mm on the D50s to 550 mm to minimize wheel spin.
The spread of electrification and increasing numbers of diesel locomotives resulted in the first D60s being withdrawn from 1966. A few examples based at Wakamatsu Depot soldiered on hauling coal trains on the Chikuhō Mainline in northern Kyūshū, and the last member of the class (D60 61) was finally withdrawn in August 1974.
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[edit] Specifications
| Overall length | 20,030 mm |
|---|---|
| Overall height | 3,955 mm |
| Driving wheel diameter | 1,400 mm |
| Total operating weight | 81.56 t (excluding tender) |
| Boiler pressure | 13.0 kgf/cm² (1.27 MPa |
| Cylinder dimensions | 550 mm dia. x 660 mm stroke |
[edit] Build details
| Numbers | Former numbers | Rebuilt at | Date |
|---|---|---|---|
| 1-10 | D50 162/44/305/116/169/199/81/168/47/211 | Hamamatsu | 1951 |
| 11-28 | D50 14/175/202/225/123/71/127/226/244/163/133/85/88/337/289/106/237/306 | Hamamatsu | 1952 |
| 29-30 | D50 112/65 | Hamamatsu | 1953 |
| 31-34 | D50 302/73/317/145 | Nagano | 1952 |
| 35-39 | D50 149/141/160/126/216 | Nagano | 1953 |
| 40-44 | D50 128/333/248/113/31 | Hamamatsu | 1953 |
| 45-62 | D50 32/157/326/35/247/159/354/192/34/51/99/265/40/197/120/152/282/229 | Hamamatsu | 1954 |
| 63-69 | D50 351/283/191/36/228 (data incomplete) | Hamamatsu | 1955 |
| 70 | D50 111 | Nagano | 1955 |
| 71-72 | D50 95/93 | Tsuchizaki | 1955 |
| 73 | D50 278 | Nagano | 1956 |
| 74-75 | D50 57/91 | Tsuchizaki | 1955 |
| 76-78 | D50 96/219/67 | Hamamatsu | 1956 |
[edit] Preserved examples
- D60 1 In grounds of Yamaguchi Prefectural Museum
- D60 27 Park in Tachibana, Fukuoka Prefecture (in poor condition)
- D60 46 Park in Iizuka, Fukuoka Prefecture
- D60 61 Park in Ashiyama, Fukuoka Prefecture
[edit] Models
In N gauge, Micro Ace produced two examples of the D60 in 2002: Nōgata-based D60-31 (A6902) and Iwamizawa-based D60-36 (A6901).
