The first steam locomotive,introduced in 1825,had a top speed of only thirteen mph,and the great sailing ships of the time laboured a long at less than half that speed.

• 1825年推出的第十辆蒸汽机最大速度每小时仅为13英里，而那时的大帆船行驶得更慢，还不到这个速度的一半。