Single-line working

In railway operations, single-line working refers to the practice where, when one line out of the two lines is blocked, trains are able to use the other in either direction. This is usually when a line is out of use for maintenance, or because of damage, obstruction or train failure.

Single Line Working
An example of single track working:
 The left track is not being used
 whilst the right one is
An example of single-line working: maintenance of way crews are working on two tracks (left) of a three-track line in the Czech Republic while a passenger train passes on the third track (right) in 2011.
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