block signal


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block signal

n.
A fixed signal at the entrance to a railroad block, indicating whether or not trains may enter.
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Most New York City subways operate with a Fixed Block Signal System.
In that case the train protection can be realised by installing inductive balises which act in accordance with the aspect of the block signal on the equipment installed onboard train, which allows, if necessary, train velocity control or its automatic stopping if the train running method endangers the traffic safety.
It also has the capability to block signals transmitted by contactless cards, modern passports and more importantly during this operation; keyless car fobs, preventing would-be thieves and identity fraudsters.
Thieves can lie in wait and block signals as owners walk away from their car.
Botox, a toxin, is produced by the bacterium Clostridium Botulinum, and it helps block signals from the nerves to the muscles, which when injected cannot contract.
It's alleged that the 18-yearold, who was arrested near Touchwood shopping centre on Sunday afternoon, stuffed coats, dresses, tops and perfume into modified bags designed to block signals from store security alarms.
No one is allowed to block signals, that is clear".