 The Hardanger Line ran 27 @.@ 45 kilometres ( 17 @.@ 06 mi ) from Voss to Granvin in Hardanger . From Voss to Skjervet , the line ran in relatively flat terrain , with easy construction . Along this section the route followed what is now Norwegian National Road 13 . At Skjervet , the two split ; towards Nesheim the gradient increased and the topography became more difficult . On this section there were four tunnels , named Skjervet Tunnel I through IV , the longest being 1 @,@ 101 metres ( 3 @,@ 612 ft ) . Between the two longest tunnels , the line was built on a shelf . Later , the tunnel was extended from 630 metres ( 2 @,@ 070 ft ) to also include that portion in the tunnel . From Skjervet , the railway ran on the west side of the river <unk> , while the road ran on the east side . 
