the name of a steam engine (= a type of early train) which set an unbeaten world record for a train of its type in 1938 by achieving a speed of 126 miles per hour/203 kilometres per hour. It is now kept at the National Railway Museum in York.绿头鸭:一种蒸汽机的名称,在1938年以每小时126英里/时/ 203公里的时速创下了该类型火车的世界纪录。现在,它被保存在约克的国家铁路博物馆。