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For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first. In North America, the official railroad definition of interlocking is: " An arrangement of signals and signal appliances so interconnected that their movements must succeed each ...
US&S built the first power interlocking system in the United States, a pneumatic design, in 1882 at East St. Louis, Illinois. Within several years the company developed an electro-pneumatic system, which was widely adopted by railroads across the country. [11]
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.
For example, to prevent access to the inside of an electric kiln while it is operating, a trapped-key system may be used to interlock a disconnecting switch and the kiln door. Whenever the kiln power switch is turned on, the key is automatically held by the interlock, and cannot be manually removed.
Interlocking signals are fixed signals within an interlocking, containing two separate green-yellow-red signal heads and often other indications. [9] A home signal is defined as an interlocking signal at the entrance to a route or block to control trains entering that route or block. Most interlockings only have one controlled signal on each track.
Early interlocking systems used mechanical devices both to operate the signalling appliances and to ensure their safe operation. Beginning around the 1930s, electrical relay interlockings were used. Since the mid 1980s, new interlocking systems have tended to be of the electronic variety. Microprocessors decide what point switch movements are ...
Ignition interlock devices have been required use for drivers in Wisconsin convicted of either: A first-time OWI offense with an alcohol concentration of 0.15% or higher A repeat OWI offender
The interlock device is located inside the vehicle, near the driver’s seat, and is directly connected to the engine’s ignition system. [1] It is a form of electronic monitoring . An ignition interlock interrupts the signal from the ignition to the starter until a valid breath sample is provided that meets maximal alcohol guidelines in that ...