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- Terrier Locomotive Class
- A class of engine used on the LBSC railway - not relevant to the LNWR at all.
- Teutonic 2-2-2-0 Locomotive Class
- The ‘Teutonic’ was developed from the ‘Dreadnought’ class, and became the most successful and, when built, the largest of F.W. Webb’s 2-2-2-0 three-cylinder compounds . Using the same boiler, they had 7ft 1in driving wheels (compared with 6ft 3in on the ‘Dreadnoughts’). The reversers for the two outside high-pressure cylinders, and the one inside low-pressure cylinder were linked, so that the driver could adjust one independently of the other. The axle boxes were lubricated by oil instead of grease, a feature introduced on the class. All except “Jeanie Deans” were named after ships of the White Star Line. “Pacific”, the third of the class, was originally built as a triple expansion compound but was soon converted to conform with the rest of the class.
- Tishy Locomotive Class
- The “Tishy” name was applied to “Prince of Wales” engines fitted with outside valve gear, which operated the valves on inside cylinders. The nickname came from a contemporary race horse which kept falling over its own legs.
- Waterloo 2-4-0 Locomotive Class
- See Small Jumbo. No.748 Waterloo was the first in the class, in the sense of having the lowest Crewe motion number.
- Watford Tank 0-6-2T Locomotive Class
- An 0-6-2 tank version of Webb’s 18in Goods, or ‘Cauliflower’, which incorporated 5ft 3in driving wheels and Joy valve gear. Intended as ‘mixed traffic’ engines, they became popular on the suburban trains between London (Euston) and Watford, from which they derived their nickname.
- Webb Compound
- A steam locomotive compound system in which two outside high-pressure cylinders exhaust into a single inside low-pressure cylinder.
- Whitworth 2-4-0 Locomotive Class
- See Small Jumbo. No.1045 Whitworth was the first of this class into traffic in September 1889.