It operated the Bilbao-San Sebastián line, as well as the Elorrio branch [eu] and the Deba railway [es].
Together with the electrification, the company acquired its first non-inherited rolling stock, composed of electric Brown Boveri and ASEA locomotives and Ganz railcars.
[6] The company reached its peak in the aftermath of the Spanish Civil War, but the improvements in road transport since the 1950s marked the start of its decline.
[4] The Elorrio branch and the Deba railway were closed in 1975, and in 1979 the operations were transferred to the Basque General Council [es].
Ferrocarriles Vascongados and its predecessors operated a total of 71 steam locomotives, built by Couillet, Nasmyth & Wilson, Porter, Hanomag and Krauss.