Limitations
The main limitation of the Whyte Notation in classifying locomotives was that it did not cover non-standard steam locomotive types such as Shay locomotives, which use geared trucks rather than driving wheels. This led to the design of other forms of classification. The most commonly used system in Europe outside the United Kingdom is the UIC classification scheme, based on German practice, which can more completely define the exact layout of a locomotive.
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“That all may be so, but when I begin to exercise that power I am not conscious of the power, but only of the limitations imposed on me.”
—William Howard Taft (1857–1930)
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