The LMS Ivatt Class 4 2-6-0 is a class of steam locomotive primarily designed for medium freight work but also widely used on secondary passenger services. The London, Midland and Scottish Railway (LMS) ordered 162 of this type between 1947 and 1952, but only three were built by the LMS before nationalisation in 1948.

The Great Northern Railway (GNR) Small Boiler Class C1 is a class of steam locomotive, the first 4-4-2 or Atlantic type in Great Britain. They were designed by Henry Ivatt in 1897.

The C1 Class, as it was known under both GNR & LNER classifications, was designed by Henry Ivatt as an enlarged version of what became the LNER C2 Class. The principle of the design was to produce a powerful, free-steaming engine to haul the …

Ivatt introduced the 4-4-2 Atlantic type to Britain with his 'Klondike' (LNER C2) type in 1898. In December 1902, he built No. 251 by adapting the design and increasing the boiler diameter from 4ft 8in to 5ft 6in. The GNR classified both types as C1, but the LNER classified the large boiler variation as C1 and the small boiler variation as C2.

LMS Ivatt Class 4 43106 is the only surviving example of an Ivatt Class 4 2-6-0 Mogul, and is affectionately referred to on the SVR Severn Valley Railway as “The Flying Pig” (often shortened to "The Pig"). The Ivatt Class 4 locomotives were designed by H.G. Ivatt for medium freight work but were also widely used on secondary passenger services.

43106 is owned by the Ivatt Class 4 Group and is based on the Severn Valley Railway where it remains operational. The next boiler overhaul is due in 2020 but with agreement from an insurance examiner it could remain in service until 2023.

These engines were designed by Ivatt in 1947 and although originally classed as 4F they were essential mixed traffic engines. Only the first three came out as LMS locomotives in December 1947, the other 158 being built after the formation of BR.

Within a year of taking office with the Great Northern Railway (GNR), Ivatt introduced the GNR's first 4-4-0 design. This design closely resembled the GNR's final series of 2-4-0s (LNER Class E1), although the first of the new 4-4-0s was built first.

Main Wikipedia article: LMS Ivatt Class 4. This category has the following 17 subcategories, out of 17 total. The following 9 files are in this category, out of 9 total.

This was the first Atlantic 4-4-2 locomotive built in Britain, and quickly acquired the nickname of 'Klondike' (or 'Klondyke') after the 1896 Gold Rush in the Klondike region of the Yukon.