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4-2-2-0
Under the Whyte notation for the classification of steam locomotives, 4-2-2-0 represents the wheel arrangement of four leading wheels on two axles, four powered but uncoupled driving wheels on two axles, and no trailing wheels. The arrangement became known as ''double single''. Usage This very unusual wheel arrangement was first used 1893 by ''Frederick Charles Winby'' for the locomotive ''James Toleman'', built by Hawthorn Leslie & Company. It was exhibited at the World’s Columbian Exposition in Chicago and then delivered to the Milwaukee Road. Between 1897 and 1901 Dugald Drummond of the London and South Western Railway used this wheel arrangement on two classes of divided drive locomotives, the T7 and E10 classes. The absence of coupling rods A coupling rod or side rod connects the driving wheels of a locomotive. Steam locomotives in particular usually have them, but some diesel and electric locomotives, especially older ones and shunters, also have them. The cou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LSWR T7 Class
The LSWR Class T7 4-2-2-0 was a prototype express steam locomotive design by Dugald Drummond for the London and South Western Railway introduced in 1897. Five similar locomotives, classified E10, were introduced in 1901. Background Number 720 was a prototype locomotive built in 1897 and classified T7. The layout was unusual and influenced by Francis Webb (engineer), Francis Webb's 3-cylinder compound locomotives introduced in 1883 on the London and North Western Railway (LNWR) that employed two pairs of uncoupled driving wheels; the Drummond locomotives were always known as the "double singles". Five similar locomotives, numbers 369-373, were built in 1901 and classified E10. Design features Throughout locomotive history, this type of layout with independent uncoupled trains of driving wheels mounted on a common rigid chassis has been repeatedly tried with various aims in mind (the best-known more recent example is the Duplex locomotive). Aims In the case of Drummond, the mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
