A bogie truck was first used on Experiment, built by John B. Jervis in 1832 for the Mohawk & Hudson Railroad. It was perfected by the Norris Locomotive Works of Philadelphia, Pa., becoming the US standard and leading to the naming of the 4-4-0 locomotive as the American-type (the first four signifies the swivel bogie, the second four is the pair coupled driving wheels, and the zero indicates the firebox is between the rear drivers and no trailing truck is used. More than 20,000 of these type of locomotives were built between 1840 and 1890, some continuing in branch-line service until the mid-1930s.