The London and North Eastern Railway Gresley Classes A1 and A3 were 4-6-2 "Pacific" steam locomotives designed by Nigel Gresley for passenger work. They were initially intended for use on the Great Northern Railway (GNR), but became a standard design on the London and North Eastern Railway after the amalgamation of 1923 .

The first two A1 Pacifics were built in the twilight years of the Great Northern Railway (GNR) and entered service in 1922. The A3 was a modification of the original A1 design, and all of the surviving A1s were eventually rebuilt as A3s. Thompson designated the remaining members of the A1 class awaiting rebuilding as the A10 Class.

英国伦敦和东北铁路公司在本文中均简称“LNER”⑴，英国大西部铁路公司简称“GWR”⑵，英国伦敦、米德兰和苏格兰铁路公司简称“LMS”⑶，英国南方铁路公司简称“SR”⑷，英国铁路简称“BR”⑸。 “Peppercorn”A1型蒸汽机车 由LNER最后一位首席机械工程师 Arthur Henry Peppercorn ⑹设计，并于1948年~1949年间由 唐卡斯特工厂 和 达灵顿工厂 制造共计49台机车，交付新成立的BR。 随着蒸汽机车的停用，所有49台“ Peppercorn”A1型机车 于1962年10月~1966年6月间退役报 …

In 1922 Greseley put the first of his three-cylinder pacific locomotives to work on the Great Northern Railway (GNR). Apart from the solitary GWR engine the Great Bear they were the first pacifics to be built in the UK. They were designed to haul …

In 1923, the LNER inherited four pacifics, to two classes each consisting of two locomotives, one class from either of two of its constituents, the Great Northern Railway (GNR) and the North Eastern Railway (NER).

The London and North Eastern Railway LNER Gresley Classes A1 and A3 locomotives represented two distinct stages in the history of the British 4-6-2 "Pacific" steam locomotives designed by Nigel Gresley.

The LNER Gresley A3 class locomotives represented two distinct stages in the history of the British 4-6-2 "Pacific" steam locomotives designed by Nigel Gresley. As A1's they were designed for main line passenger services and later express passenger services, initially on the GNR, a constituent company of the LNER after the amalgamation of 1923 ...

Below are the names and numbers of the steam locomotives that comprised the LNER Gresley Classes A1 and A3, that ran on the Great Northern (GNR) and latterly the London and North Eastern Railway network. They represented Nigel Gresley's attempt to standardize steam design.

The Flying Scotsman is an LNER A3 "Pacific" steam locomotive that was designed by Sir Nigel Gresley, built February 24, 1923 by Doncaster Works in Yorkshire, Britain as GNR No. 1472 (later renumbered to LNER 4472), and was the first locomotive in the world to …

The A3 class was a development of the Great Northern Railway (GNR) A10 class Pacific locomotive, which was introduced in 1922.