Single track

Single track may refer to:

Single track (mountain biking)

Single track or singletrack is a narrow mountain biking trail that is approximately the width of the bike. It contrasts with double track or fire road which is wide enough for four-wheeled off-road vehicles. In addition it is frequently smooth and flowing, but it may also exhibit technical rocky sections and may be criss-crossed with tree roots. Some trails are winding and flowing, while others are bumpy and challenging. Many trails offer features such as roots, logs and rocks. Single track paths can be ridden using a mountain bike, BMX bike or race bike. Single track riding can be quite challenging from a technical standpoint. Singletracks cover vast areas of both state and national park lands.

Trail building in the US

There are volunteers, both organized and rogue, that maintain and create single track trails throughout the country. The organized volunteers coordinate with park districts to modify the natural woods to accommodate single track bikers. Some paths are created from scratch, while others are modified hiking paths.

Single-track railway

A single-track railway is a railway where trains travelling in both directions share the same track. Single track is usually found on lesser-used rail lines, often branch lines, where the level of traffic is not high enough to justify the cost of constructing a second track.

Advantages and disadvantages

Single track is significantly cheaper to build, though it has operational disadvantages. If the single-track section is say 15 minutes long, the line would have capacity for only two trains per hour in each direction. Double track can allow up to 15 trains per hour in each direction if signal boxes are four minutes apart and provided all the trains travel at the same speed. This hindrance on the capacity of a single track may be partly overcome by making the track one-way on alternate days, if the single track is not used for public transit.

Long freight trains are a problem if there are not enough long passing stretches. Other disadvantages include the spread of delays, since if one train on a single track is delayed, any train waiting for it to pass also will be delayed. Also, single track does not have a "reserve" track that can allow a reduced capacity service to continue if one track is closed.

The Single Track

The Single Track is a lost 1921 American silent melodrama film directed by Webster Campbell and starring Corinne Griffith. The film is based upon a story by Isabelle Ostrander writing under the pseudonym Douglas Grant. The film was produced and distributed by Vitagraph.

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