One batch of fifteen locomotives were built, and were classified with the "1321" locomotives as Class D1 by the Great Northern Railway (GNR). The LNER split the class, with the "1321" locomotives being reclassified as D2.

As is customary, engine classes are organized according to the man who was locomotive superintendent when the class was introduced, and to whom the design is often attributed. Six men held this post during the existence of the Great Northern Railway.

The GNR Classes D2 and D3 were two classes of 51 4-4-0 steam locomotives designed by Henry Ivatt for the Great Northern Railway (GNR). They were the first 4-4-0s to be introduced by the GNR, and Ivatt's first original design for the railway as well.

Following the totally new departure in locomotive design [that is the Ivatt Atlantic], Mr. Ivatt brought out an enlarged pattern of the eight-wheeled bogie passenger locomotive, its principal features of difference from the No. 400 class being in respect to the use of a larger boiler and firebox, this latter causing a greater length of wheel-bas...

The LNER D2s were classified as "D1" by the Great Northern Railway (GNR), but were usually known as the "1321" class after the first locomotive. A total of seventy locomotives were built in seven batches between 1898 and 1909.

May 22, 2023 · Designed by Ivatt and introduced in 1898, 65 locomotives of the GNR D1 were built with the footplate raised over the coupling rods, allowing for better access to the oiling points. They were usually known as the “1321” class.

The LNER 4-4-0 'American' Locomotives D1-D24. The 4-4-0 was introduced to Britain in the 1850s with outside cylinders. The inside cylinder form became the archetypical British express locomotive in the late 19th Century. When superseded by Atlantics or 4-6-0s the type was versatile enough to continue on secondary passenger duties in many areas.

Mar 4, 2020 · These belonged to three classes: GNR D1, D2 and D3. The first type was derived from the Stirling 2-4-0s but was fitted with a swing link bogie and 4ft 5in domed boiler. 51 locomotives of this type were constructed between 1896 and 1899.

Ivatt GNR Class D1 (Superheated), 15 engines built. Weight: 53 tons; Pressure: 170psi; Cyls: 18 x26; DW: 6 ft 8; TE: 16,075 lbs. In 1925 the whole class was moved to Scotland but were never very successful and were nicknamed 'ponies'. 7 returned south, 1930-2 …

Its boiler was the first domed “standard” boiler with 4ft-5in diameter barrel, superseding the earlier straightback design. No straightback boilers were ever fitted to the 4-4-0s, their use being limited to Classes J5, J8, J9 0-6-0s; F3 0-4-2s; J16 0-6-0STs. The engine was rebuilt (1920) to Class D3 (see later under GRESLEY).