The NRHS was founded in 1935 by a group of rail historians. It has since grown from 40 founding members to include over 13,000 men and women of all ages and professions in every state and many foreign countries, making it the nation's largest rail preservation and historical society. The original society was formed as a consolidation of two of the earliest railfan clubs in the US, the Lancaster (PA) Railway & Locomotive Historical Society and the Interstate Trolley Club of Trenton NJ. The official goal of the new society: "to preserve steam and electric railway historical material; to encourage the building of model railways; to secure data on the history of transportation; and to encourage rail transportation.