Ow did the development of the railroads in a number of north atlantic countries and in particular USA, influence their pattern of economic growth?

number or sources given as guide, use as many as you feel appropriate

useful books;
chris freeman and luc soete(1997) the economics of industrial innovation, third edition

Alice H Amsden(2001) the rise of the rest: the challenge to the west from late industrialising economies
please use harvard method so i can find it easily in the texts. e.g (example,2007,69)