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| name = Westinghouse Rail Systems Ltd '''Westinghouse Rail Systems Ltd''' (formerly '''''Westinghouse Signals Ltd''''') was a British supplier ...

...her items of signalling apparatus, thereby serving as a portable form of [[interlocking]]. The purpose is to prevent access from sidings to the running line witho [[Category:Interlocking systems]] ...

...ally dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to t ...], and [[lock and key|locks]]. It can also be a [[computer]] containing an interlocking [[computer program]] with [[digital electronics|digital]] or [[analogue ele ...

...ent, especially in traffic industries. Man, Machine, and Medium form three interlocking circles, with Mission at the intersection, and the space surrounding them r ...</ref> at [[Cornell University]], the 5M model incorporates a diagram of 3 interlocking circles and one all-encompassing circle. The smaller circles are labeled '' ...

===Interlocking notches=== ===Interlocking studded bricks=== ...

...Railroad switch|switches]] (points), signals and block systems is called [[interlocking]]. ...Plaines interlocking tower.jpg|thumb|right|Signal box and tracks at Deval interlocking, [[Des Plaines]], in 1993]] ...

...oducts = [[Railway signalling|Railway signaling]] equipment, communication systems and services, [[level crossing signals]] ...rgh]], [[Pennsylvania]], which focused on [[railway signaling]] equipment, systems and services. The company was acquired by Ansaldo STS (from 2015, [[Hitachi ...

* compatibility of systems across railroads. This helps to ensure seamless operation. For example, loc * management of track occupancies through centralized route and block interlocking logic; ...

[[File:Des Plaines interlocking tower.jpg|thumb|The tower and tracks at Deval interlocking, [[Des Plaines, Illinois]], in 1993]] ...eferred to as an ''interlocking plant'' or just as an ''interlocking''. An interlocking system is designed so that it is impossible to display a signal to proceed ...

{{Short description|Hardware and software controls used on critical process systems}} ...angerous conditions occur. Because of its criticality, safety instrumented systems must be independent from all other [[control system]]s that control the sam ...

* [[Interlocking tower]] or control cabin, directs railroad traffic ...r Transit]], a bus operating company in London since 2013 owned by Transit Systems ...

...ications)|transmission]] of [[classified information]]. At one time these systems were called "'''approved circuits'''". ...r 7003 |date= December 13, 1996 |publisher= Committee on National Security Systems |url= http://www.cnss.gov/Assets/pdf/nstissi_7003.pdf |url-status=dead |arc ...

...ts of a centralized [[train dispatcher]]'s office that controls railroad [[interlocking]]s and traffic flows in portions of the rail system designated as CTC terri ...em was further automated by the use of [[Automatic Block Signaling]] and [[interlocking tower]]s which allowed for efficient and failsafe setting of conflicting ro ...

...[Toronto subway]] uses a variety of [[railway signalling system|signalling systems]] on its lines, consisting of a combination of fixed [[block signalling]] a ...e instructions to train operators, which may be automatic block signals or interlocking signals. This system, also called the [[automatic block signalling|NX/UR]] ...

...tate Interlocking]]s (SSIs), a software version of the traditional relay [[interlocking]], but existing relay interlockings may also be controlled from an IECC. Th ...us [[Railway signalling|signalling]] contractors, e.g. [[Westinghouse Rail Systems]] WESTCAD. ...

{{Short description|Square or rectangular interlocking boxes}} '''Milk crates''' are [[Square (geometry)|square]] or [[rectangular]] interlocking [[box]]es that are used to transport [[milk]] and other products from [[da ...

The electronic interlocking system “LockTrac 6131 ELEKTRA” was designed within a cooperation of [[Thale ...afety integrity level 4 ([[Safety Integrity Level|SIL4]]) and offers basic interlocking functions, local and remote control, automatic train operation, integrated ...

{{About|toys and building systems|video games|Level editor|the theater construction|Set construction|||}} [[File:Interlockingdisks.jpg|thumb|Interlocking disks enable the construction of high-symmetry models such as that of {{che ...

...en. The token is then transmitted to the train by radio. The [[Solid State Interlocking]] controlling the system prevents the issue of any token permitting conflic ...cross by the wheels for trailing movements; they too require no power or [[interlocking]], other than for points heating purposes. In the facing direction, a 'poin ...

...overn train movements through the diamonds. Because the crossing was not [[interlocking|interlocked]], all trains were required to make a stop before proceeding ov ...um speed on the route was between 20-30&nbsp;mph.<ref name="prrDiagram" /> Interlocking the Brighton Park crossing would have been of limited value without upgradi ...