- Jeanie Deans
- An engine of the “Teutonic”
 class was for several years was the regular engine on The Corridor. The engine was named after a Walter Scott heroine.
- Jinty Locomotive Class
- Spotters’ nickname for a class of inside-cylinder 0-6-0 tanks built by the LMS in 1924-31, based on a Midland design.
- John Hick 2-2-2-2 Locomotive Class
- A class of 2-2-2-2 compound locomotives built by Webb from 1894, similar to the “Greater Britain” class but with smaller 6ft 3in driving wheels. Presumably the smaller driving wheels were intended for the Crewe—Carlisle main line, while the “Greater Britains” worked south of Crewe. In practice, the “Greater Britains” took expresses to Carlisle and the “John Hicks” found their home on secondary expresses.
- Johnny Dougans Locomotive Class
- Nickname for “A” Locomotive class.
- Jubilee 4-4-0 Locomotive Class
- The first type of 4-cylinder compound passenger engine designed by F.W. Webb, 40 of which were built at Crewe Works from 1897. A 4-4-0 type with driving wheels 7ft 1in diameter. At 9ft 8in long, their coupling rods were the longest in the country at that time. These engines were used on the heaviest and fastest trains on the line, until superseded by the ‘Alfred the Great’ class in 1901, which were very similar but with larger boilers.
- Jumbo Locomotive Class
- “Jumbos” were not only capable of high speeds but regularly hauled heavy loads in relation to their small size, and so they well deserved their nickname. They were designed by F.W. Webb, and 166 of them were built at Crewe Works between 1887 and 1901. Known officially as the ‘Improved Precedent’ class, they were developed from John Ramsbottom’s Newton Class of 1866–73. One of the most famous ‘Jumbos’ was No.790 Hardwicke. During the ‘Races to the North’ in 1895, it set a record which was to last for almost forty years. Hauling the west coast train from Crewe to Carlisle, it covered the 141 miles of hilly road, including four miles of 1 in 75 Shap Summit, at an average speed of 67¼mph, and achieved speeds over 90 mph. It is now preserved in the National Railway Museum, York England. Even more famous in its day was No.955 Charles Dickens. This engine worked the 8.30am express from Manchester to London Euston and the 4pm return for twenty years and so covered more than 2 million miles, a record that has never been broken by any other steam engine.
- Lady of the Lake 2-2-2 Locomotive Class
- The most famous engine in the ‘7ft 6in Single’ or ‘Problem’ class was No.531 Lady of the Lake, since it was awarded a bronze medal at the International Exhibition in 1862. As a result, its name came to be used colloquially as the class name.
- Large Bloomer 2-2-2 Locomotive Class
- The most famous engines on the Southern Division were the ‘Bloomers’. They were inside-cylinder inside-frame single-wheelers and were designed by McConnell. The first to appear were the so-called ‘Large Bloomers’, introduced in 1851. See also Extra Bloomer, Large Bloomer, and Small Bloomer
- Large Jumbo 2-4-0 Locomotive Class
- A term usually applied to a class of 2-4-0 passenger tender engines with 6ft 6in driving wheels introduced by Webb in 1887 and officially described as ‘Improved Precedent’ class because they were a rebuilt and improved version of an earlier design, the first engine of which carried the name ‘Precedent’. Ramsbottom’s ‘Newton’ class 6ft 6in engines were also rebuilt into ‘Improved Precedents’, the two types then being identical. The word ‘Jumbo’ was probably coined because the engines were able to haul very large trains, and the word ‘Large’ set them apart from the similar engines with smaller driving wheels.
- Mansion House Tank Locomotive Class
- Type of locomotive used on the sub-surface lines of the District Railway in London during the days of steam traction, and fitted with condensing apparatus enabling the locomotive to (partially) consume its own steam and smoke.
- Metropolitan Tank 4-4-0T Locomotive Class
- In 1871 16 4-4-0 tank engines were ordered from Beyer Peacock. They were fitted with condensing apparatus and were intended to work suburban services in the London area.
- Mixed Traffic Locomotive
- A locomotive suitable for use on both passenger and freight trains.
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