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For example, Union Route (UR) was the brand name of their Entrance-Exit system supplied by Union Switch & Signal Co. (US&S), and introduced in 1951. [16] NX type systems and their costly pre-solid state control logic only tended to be installed in the busier or more complicated terminal areas where it could increase capacity and reduce staffing ...
Trapped key interlock switchgear door. An interlock is a feature that makes the state of two mechanisms or functions mutually 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 the machine or to the operator handling the machine.
WESTLOCK Interlocking is a Computer-based interlocking (CBI) product now sold and maintained by Siemens Mobility Limited, following their purchase of Westinghouse Rail Systems. Westlock builds on many of the features that made SSI popular in the United Kingdom. This includes re-use of SSI's programming language and its track-side hardware.
Standards for North American railroad signaling in the United States are issued by the Association of American Railroads (AAR), which is a trade association of the railroads of Canada, the US, and Mexico. Their system is loosely based on practices developed in the United Kingdom during the early years of railway development. However, North ...
A key exchange block may only hold and release keys and may not have a bolt to interlock process equipment, or may be part of the interlock of a particular machine or device. This is a transfer block, part of a trapped-key interlock system. It does not have a bolt to stop operation of a device, but holds and releases other keys.
An SSI interlocking cubicle comprises three Interlocking Processors or Multi Processor Modules (MPMs), two Panel Processors and a Diagnostics Processor (DMPM). An SSI system can operate on two MPMs in the event of the failure of one. It does not need the DMPM to function as an interlocking, as this drives the technician's terminal only.
Computer-based interlocking is railway signal interlocking implemented with computers, rather than using older technologies such as relays or mechanics. General [ edit ]
"NX" (eNtrance-eXit) systems (relay-based cTc), 1937. [6] First fully automated freight yard, 1955. [7] Computer-based central control office, 1968. First fully automatic computer-planned and executed train meet, 1981. Microprocessor based Interlocking ("Vital Processor Interlocking"), 1986. [8] Amtrak Northeast Corridor Improvement Project, 1980s.