speed date country train arr. power state comments
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202.6 km/h (126 mph) 1938-07-03 uk lner class a4 no. 4468 mallard loc steam unkn downhill grade. data indicates peak speed 202.6 km/h (126 mph), mean speed (half-mile) 201.2 km/h (125 mph). mallard suffered an overheated crankpin during the run, but was repaired and returned to traffic within 9 days
which was the only country to exceed 200 km\\/h before 1937 ?
WDT VBD-AUX DT JJ NN TO VB CD NN IN CD .