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Railway signal in Ploiești West railway station, Romania. This type of signal is based on the German Ks signals. The signal head is the portion of a colour light signal which displays the aspects. To display a larger number of indications, a single signal might have multiple signal heads.
The signal's aspect is based on a combination of the aspects each individual head displays. Where a signal has multiple heads, aspects are read from top to bottom and are described as "X over Y over Z". Dwarf signals are smaller signals used in low-speed or restricted-clearance areas. Most signaling aspect systems have a parallel set of aspects ...
The NORAC rule book illustrates all signal aspects and indications which may appear on track operated by member railroads. However, GCOR does not illustrate signal aspects and indications because of the lack of uniformity between the participating railroads. Signal aspect and indication illustrations instead appear in each railroad's system ...
Such signals as electrically operated automatic and interlocking signals were widely adopted in the U.S. After 1908 with the advent of the Union Switch & Signal's Styles "B" & "S" and the General Railway Signal Company's universal Model 2A mechanisms manual semaphores and earlier electric disc signals quickly began to disappear.
Procession of a train past a stop signal with verbal permission from the dispatcher. [4] Derives from Rule 241, which is used to grant such permission under certain rule sets. [5] 251 (US) On most Class I railroads, this rule references the tradition of "right hand" running on double track (or more) main lines.
Pages in category "Railway signaling in the United States" The following 18 pages are in this category, out of 18 total. This list may not reflect recent changes .
Pages relating to railway signals and signal-related devices, technology and terminology. Subcategories This category has the following 13 subcategories, out of 13 total.
Bidirectional signalling is the provision of signalling that allows one or more tracks on a multiple track railway to be operated in either direction, whether for regular or emergency use. Bidirectional signalling intended for regular use will generally allow traffic to flow at similarly high frequency in one or other direction.