The train and industrialisation were key elements in the historical, economic and social evolution of the town. Zumarraga opened itself up to development but maintained its traditions.
Zumarraga has a before and an afterwards in terms of the arrival of the train
The train changed the appearance of Zumarraga: the municipal district expanded, a new building for the Town Hall, a hospital and a school were built. Inns and hotels sprang up with the train, and modern industry reasserted itself.
Zumarraga became a privileged locality
The geographical location turned the town of Zumarraga into a privileged locality in Spain as it had three railway stations: the Ferrocarril del Norte (Northern Railway) station, the Ferrocarriles Vascongados (Basque Railways) station, and the Urola Railway Station. They all converged on the Plaza de las Estaciones (Station Square).
Furthermore, in the 1940s Patricio Echeverría built an industrial branch line between Zumarraga and Legazpia with three railway lines.
In the 1950s Zumarraga was a hub for the coming and going of goods and passengers: over a million passengers a year.