Running through the regions of Southwest Finland, Kanta-Häme and Pirkanmaa, it connects the junction stations of Turku and Toijala in the southwest–northeast direction.

[1][2] Around the time of the completion of the Helsinki–Hämeenlinna railway – the first of its kind in Finland – planning its extensions towards the south to Turku and north to Tampere became relevant.

The northern terminus of the former route was subject to debate; in time, the village of Toijala was chosen as a compromise.

[1] VR Group operates long-distance services with InterCity and Pendolino type rolling stock on the line.

[3] This Finland rail transport related article is a stub.