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NZR AB class
The NZR AB class was a class of 4-6-2 Pacific tender steam locomotive that operated on New Zealand's national railway system. Originally an improvement on the 1906 A class, 141 were built between 1915 and 1927 by NZR's Addington Workshops, A & G Price Limited of Thames, New Zealand, and North British Locomotive Company, making the AB class the largest class of steam locomotives ever to run in New Zealand. An additional ten were rebuilt from the tank version of the AB – the WAB class – between 1947 and 1957. Two North British-made locomotives were lost in the wreck of the in May 1922.
== Construction and design ==
The genesis of the AB class originated from the construction of A class 4-6-2 NO 409 at Addington Railway Workshops in 1906. A two-cylinder simple-expansion locomotive, 409 was initially classified AB to differentiate it from the four-cylinder compound A and AD class locomotives, which were by and large of a similar design although built as compounds. AB 409 was in reality the 'guinea pig' for what would become the most prolific type on the New Zealand Railways network, with construction beginning on a new prototype 4-6-2 in 1915.
The new locomotive, AB 608, was to a completely different design from AB 409 when it emerged from the Addington Workshops in 1915. Although largely similar to the A class, it had a new design of cab and boiler, which was fitted with a superheater after trials conducted on AB 409. It also had the distinctive Vanderbilt tender, which would become a hallmark of the AB class during its working life. This locomotive was to become the first of 141 similar locomotives built by various builders in New Zealand and the United Kingdom for NZGR.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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