Train stop
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Part of a railway signalling system, a train stop, trip stop or tripcock is a train protection device that automatically stops a train if it attempts to pass a signal when the signal aspect and operating rules prohibit such movement, or if it attempts to pass at an excessive speed.
A signal with associated trip arm in the raised position (circled)
Train-mounted trip cock, located on the leading bogie of a Siemens EMU
Train stop of Berlin S-Bahn
Union Switch & Signal
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Union Switch & Signal was an American company based in Pittsburgh, Pennsylvania, which focused on railway signaling equipment, systems and services. The company was acquired by Ansaldo STS in 1988, operating as a wholly-owned company until January 2009, when US&S was renamed "Ansaldo STS USA" to operate as a subsidiary of Ansaldo in the Americas and Asia.
US&S head office located in Swissvale, Pennsylvania, as seen in 1929
US&S signal bridge, pictured in 1913
US&S position light signal, 1922
Mechanism of a searchlight signal made by Union Switch & Signal in 1944 for the Rock Island Railroad