Samuel Smiles, The Life of George Stephenson and of his Son Robert Stephenson
“ Every thing had, as it were, to be begun from the beginning. The coal-wagon, it is true, served in some degree as a model for the railway-truck; but the railway passenger-carriage was an entirely novel structure. It had to be mounted upon strong framing, of a peculiar kind, supported on springs to prevent jolting. Then there was the necessity for contriving some method of preventing hard bumping of the carriage-ends when the train was pulled up, and hence the contrivance of buffer-springs and spring-frames. ”
