The line takes its name for passing under the neighborhood of Tyholt and only sees regular freight traffic.

[3] During the German occupation of Norway as part of the Second World War, the Wehrmacht wanted a railway route past Trondheim which was guarded against sabotage.

However, construction of the tunnel took much longer than expected, so instead the Wehrmacht started laying railway tracks in the streets in Trondheim.

The tunnel received an outer precast concrete shell and an inner ring cast with formwork.

[3] The main concern was the up to 1.0-meter (3 ft 3 in) thick layer of quick clay, which would stick to the shield.

[3] The line and tunnel were officially opened on 1 June 1957 and revenue traffic started the following day.