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The B class of 1899 was a class of steam locomotives that operated on New Zealand's national rail network. An earlier B class of Double Fairlies had entered service in 1874, but as they had departed from the ownership of the New Zealand Railways (NZR) by the end of 1896, the B classification was free to be re-used. Despite early difficulties they were amongst NZRs' most influential designs.
The B class was designed as a larger, more powerful locomotive to handle mainline freight trains that were becoming too heavy for locomotives of the O, P, and T classes. The first was built in NZR's own Addington Workshops in Christchurch and entered service on 4 May 1899, and an order was placed with Sharp, Stewart and Company of Glasgow, Scotland to supply four more. The first engine from Scotland entered service on 20 December 1899, followed by the other three within the next month.
Over the course of 1901–1903, five more Bs were built in Addington Workshops, with the last entering service in May 1903. The locomotives were advanced for their time, featuring a new piston valve design and a modified form of Walschaerts valve gear, and they were designed to haul 600-long-ton (610 t; 670-short-ton) freight trains on flat lines and 220 long tons (224 t; 246 short tons) on the hilly section of the Main South Line between Oamaru and Dunedin. For the time, these were quite significant figures. The Addington engines were unusual in the fact that they employed a screw reverse configuration, instead of the standard reversing lever. They also had fold down seats for both driver and fireman.
The NZR B class of 1874 was the first of two steam locomotive classes to be designated as B by the Railways Department that then oversaw New Zealand's national rail network (the second B class was introduced in 1899). Ordered from the Avonside Engine Company in 1874, the locomotives were of the Double Fairlie type and were the first British-built locomotives to feature Walschaerts valve gear. They were not the first Double Fairlies to operate in New Zealand, as the first two members of the E class had commenced operations in 1872.
The first member of the B class, nicknamed Snake, was introduced in September 1874 and it worked in Auckland; it was followed by its partner Lady Mordaunt on 5 April 1875, which was based in Otago. This lcomotive had been ordered by the Otago Provincial Coouncil to work the lightly laid Awamoko branch, but advice received by the council before it an arrived was that it was too heavy. It was sent to work elsewhere and two more locomotives were ordered instead.
The DHR B Class is a famous class of 2 ft (610 mm) gauge 0-4-0 ST saddle tank steam locomotives used on the Darjeeling Himalayan Railway (DHR) in West Bengal, India.
A total of 34 B Class locomotives have served on the DHR. Some are still on the working roster. One, no. 778, was sold for private preservation, and four others were sold to Coal India, Assam. The remaining class members have been either plinthed in various locations in northern India, or scrapped.
Initially, all members of the class were liveried in DHR green. For a short period at the end of World War II, they were repainted black. Later, they ran in an unlined red colour. Since coming under the control of the Northeast Frontier Railway in 1958, they have been painted Caledonian blue with white lining.
Media related to DHR B Class at Wikimedia Commons
