Infrastructure
The line is single track through very steep terrain rising 150 m above sea level in its 10 km length, with the highest point (152 m) at the north end of No 6 tunnel. It has seven narrow tunnels, six bridges, three passing loops and three level crossings with half-barriers, (at the Fraser Avenue crossing barriers were installed in 2009). The ruling grade is 1 in 36. In 2001, an estimated 1,043 passengers use the line on a working day.
The Wellington City Council let a $1.7m tender to replace the Rangoon Street single-lane overbridge of c1906, which crosses the Johnsonville line, with a two-lane bridge. Work commenced in June 2008 and was completed by December 2008.
Read more about this topic: Johnsonville Branch