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.

Now for Gordon's true origins - the fictional side of the A0 Pacific locomotive story. We believe he is in fact the A0 design, albeit rebuilt and modified to a mechanically identical, but outwardly unique, locomotive. The description of Gordon in TIOS is clear:

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 Great Northern Pacifics, were of GNR Class A1, designed by Nigel Gresley and numbered 1470/1.

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 standardise steam design.

2021年10月31日 · Description: A prototype of the GNR/LNER Gresley A1s before the 1923 Grouping sold to the North Western Railway (NWR) Gender: Cis Male (All of the information below is from the following source: ttte.fandom.com/wiki/Gordon) Purpose: An express engine intended to pull the NWR's express service the Wild Nor' Wester

It would be in these two crucial areas that the A0 Pacific, if built, would have seen major modifications. The rebuilding of some of the Raven Pacifics, with a Gresley Taper Boiler (and Gresley standard pattern cab), shows how the original A0 …

2021年9月3日 · A proposed 4-6-2 Pacific design which is a modification of the GNR C1 Atlantic which was designed by Henry Ivatt. The A0 to put it simply is the C1 but with another set of drivers to turn it into a 4-6-2. The A0 predates Gresley's A1 Pacifics, so the A0 was used as a testbed of this type of design.

A Pennsylvania Railroad K4 locomotive, which inspired Nigel Gresley to design his GNR A1 class locomotive. The new Pacific locomotives were built at the Doncaster "Plant" in 1922 to the design of Nigel Gresley, who had become Chief mechanical engineer of the GNR in 1911.

2021年9月23日 · "Although never given an official class designation on the Great Northern Railway, this prototype Pacific class 4-6-2 was affectionately nicknamed the "A0" by its chief designer, Sir Nigel Gresley, and his compatriots.

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.