Turn (railroad)

Tehachapi Loop in California

Reversing loops on the old Moffat Route over Rollins Pass in Colorado

Guanyinshan loops on the Baoji – Chengdu railway line in China .

Pfaffensprung spiral tunnel and double loop with spiral tunnels near Wassen on the north ramp of the Gotthard Railway in Switzerland

Bends are part of a railway connection and are used to ascend or descend the route , usually in low and high mountains . Bends can be built above ground as a spiral viaduct or underground as a spiral tunnel . From circle sweeping is used when the route changes by at least 360 ° and the track crosses itself. Roundabout tunnels were built more often than roundabout viaducts .

Examples of the application of reverse loops in the construction of railways:

Africa
- South Africa
  - Natal Main Line
    - two loops above Pietermaritzburg
    - two loops on the south side of Van Renn's Pass on the branch route to Harrismith
America
- United States
  - California
    - Tehachapi Loop
    - Williams Loop
  - Colorado
    - Moffat route : several loops (including Big Ten Curve ) on the old route over the Rollins Pass
    - Georgetown Loop Railroad
  - Pennsylvania
    - Horseshoe Curve
- Argentina
  - Tren a las Nubes
Asia
- China
  - Railway line Baoji – Chengdu - Guanyinshan loops: three loop loops and one loop tunnel
- India
  - Darjeeling Himalayan Railway has three roundabouts, but also switchbacks . With a combination of a hairpin and a roundabout, the direction of the route changes by 540 °.
- Myanmar
  - The Mandalay - Lashio rail line has five loops at the Goteik Viaduct
- Sri Lanka
  - Colombo – Badulla railway line : Open roundabout at Demodara station
Australia / Oceania
- New Zealand
  - Raurimu Spiral , North Island Main Trunk Railway
  - Driving Creek Railway - several hairpin bends, some using bridge structures

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