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Signal passed at danger
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=== Train stops === {{Main article|Train stop}} On the [[London Underground]] (for example), mechanical [[train stop]]s are fitted beside the track at signals to stop a train, should a SPAD occur. Train stops are also installed on main line railways in places where tripcock equipped trains run in extensive tunnels, such as the on the [[Northern City Line]] where the [[Automatic warning system]] and [[Train Protection & Warning System]] are not fitted.
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