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is the absolute block section. To clear the intermediate block home signal a "line clear" is required from the signal box in advance. An intermediate block...

10 minutes after, they would show a caution signal, and after 10 minutes, the line was assumed to be clear. Therefore, if a train failed within a section...

junction signal, the signal may step up to a less restrictive aspect (single yellow, two yellows or green) depending on how far ahead the line is clear. Some...

running signal was the Home signal, an absolute stop signal with a red arm. Route signalling was used to indicate the line to be taken at junctions. Advance...

run out.: 73, 82  Station timer signal, signal will clear if approached at the displayed speed.: 73, 82  Older signals on the former IRT lines may use...

along a running line main line. A 'proceed' aspect on a main signal indicates that the line is clear at least as far as the next signal, giving the driver...

The signal can then be presented on the same plate is a distant signal (warning or announcement of speed), an image of the home signal (track clear, stop...

section ahead of it to clear without blocking the line all the way back to the previous section. German home semaphore signals (Hauptformsignale) can...

registers kept in the signal boxes: the investigation determined that the line-clear signal had not been sent by the Lewisham signal box, despite being recorded...

without an appropriate token, even if the starting signal is clear. Home, starting and block signals on Japanese railways are usually lights composed of...

basic signal rules (common to all railroads) he/she is to follow in the operation of his/her train at any point on the railway line. These include Clear (ARA...

A signal passed at danger (SPAD): 75  is an event on a railway where a train passes a stop signal without authority. This is also known as running a red...

signal Listen to a busy signal from North America, Hong Kong, and South Korea. Example of an old North American busy signal Listen to a busy signal from...

oldest signalling system is known as automatic block signalling and was designed for the system's heavy rail lines: Line 1 Yonge–University, Line 2 Bloor–Danforth...

video format that typically carries a 405, 525 or 625 line interlaced black and white or color signal, on a single channel, unlike the higher-quality S-Video...

In electronics, noise is an unwanted disturbance in an electrical signal.: 5  Noise generated by electronic devices varies greatly as it is produced by...

Traffic lights, traffic signals, or stoplights – also known as robots in South Africa, Zambia, and Namibia – are signaling devices positioned at road intersections...

block signalling from the Sunshine signalbox. At Sydenham, the preceding signalbox on the Bendigo line, Milburn was given a "line clear" signal, because...

Marker Post is placed 1 km ahead of this signal to warn train driver of level crossing ahead. If Signal is not clear driver must slow down the train and proceed...

clear to send (CTS), data terminal ready (DTR), and data set ready (DSR). The standard specifies a maximum open-circuit voltage of 25 volts: signal levels...