The British Rail Class 43 (HST) is the TOPS classification used for the InterCity 125 High Speed Train power cars, built by BREL from 1975 to 1982.
The class is the fastest diesel unit in the world, with an absolute maximum speed of 148 mi/h (238.2 km/h), and a regular service speed of 125 mi/h (201.2 km/h). There are claims that this diesel rail speed record has been broken twice unofficially: by a Russian train in 1992 achieving 168 mi/h (270.4 km/h), and a Spanish train reporting 159 mi/h (255.9 km/h) in 2002.
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