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Examples of single line tokens: Tablet on left, key token on right. The operation of a bidirectional single track line has the hazard of two trains colliding. The simplest way to prevent such collisions is to have only one train in the section at any given time. Such a system is known as "one-engine-in-steam” (OES) or “one-train working ...
A siding used as a passing place on a main line, where slow trains may be held whilst an express passes—a simpler, but less convenient, form of the passing loop Reporting mark A two- to four-letter code, assigned by the Association of American Railroads , that is applied to equipment operating on North American railroads to identify the owner ...
A signalling problem is causing "major disruption" on trains running through Wiltshire. Great Western Railway services between Swindon and Chippenham are either cancelled or delayed by up to an ...
In Portugal, the telephonic block was the main safety system across the national railway network until the mid-1990s due to lack of resources. Thus, it evolved to try to provide multiple layers of safety on busy single-track lines with diverse train types, albeit at the cost of high levels of staffing.
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The New York City Subway system has, for the most part, used block signaling since its 1904 opening. As of May 2014, the system consists of about 14,850 signal blocks, 3,538 mainline switches, 183 major track junctions, 10,104 automatic train stops, and 339,191 signal relays. [2]
A torpedo on a rail A detonator on a railway line in Belgium South African example. Typical uses of detonators include: A warning, caution or stop signal in dense fog, when signals are difficult to see; A warning of a train stopped on the line ahead by an incident or accident—the train crew are usually responsible for placing the detonators