 This line saw heavy traffic until the 1970s, since all trains heading for Ostrobothnia and Jyväskylä went through Haapamäki.The number of trains heading for Ostrobothnia via Haapamäki dropped off in 1971 as a result of the line from Tampere to Seinäjoki via Parkano being built.The number dropped even further once the Pori line was closed.