The London, Midland and Scottish Railway (LMS) Hughes Crab or Horwich Mogul is a class of mixed-traffic 2-6-0 steam locomotive built between 1926 and 1932.

The inspiration came from a Caledonian Railway 2-6-0 design at the grouping, however the cylinders were too large for the LMS's English section's loading gauge, resulting in Hughes having to adapt the concept.

Standard Midland Railway boiler fittings and brake equipment were also substituted, and the class became something of a hybrid design.

Nevertheless they performed rather well in most circumstances and gained a strong reputation in some areas, especially in Scotland, where they became the preferred locomotive for heavy unfitted mineral work on difficult routes, even after the introduction of the Stanier mixed traffic 4-6-0s.

Modifications of the chimney and blast pipe improved the maximum rate to 20,000 pounds per hour (9,100 kg/h) but no other engine was modified to take advantage of this.

There were so many changes to the layout of the locomotive, such as higher boiler pressure and smaller cylinders, that it became a new design, the LMS Stanier Mogul.

[9][10][11] Another suggestion is that the nickname refers to the "scuttling" motion felt on the footplate when the engine is being worked hard,[10] due largely to the inclined cylinders, producing a sensation that it is walking along the track.

In some areas they also received the nickname "frothblowers" from their tendency to prime easily when the boiler was overfilled, or the feedwater contaminated.

[19] The boiler was subsequently cut up in a Nottingham scrapyard having been sold by the owner to pay for the costs of moving it from Binbrook.