Automatic train control
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Automatic train control (ATC) is a general class of train protection systems for railways that involves a speed control mechanism in response to external inputs. For example, a system could effect an emergency brake application if the driver does not react to a signal at danger. ATC systems tend to integrate various cab signalling technologies and they use more granular deceleration patterns in lieu of the rigid stops encountered with the older automatic train stop (ATS) technology. ATC can also be used with automatic train operation (ATO) and is usually considered to be the safety-critical part of a railway system.
Japanese-style ATC cab signalling indicator
A Tokyu Corporation train with ATC-10 indicator operating under normal conditions
The said ATC-10 indicator with ORP (Over Run Protector) engaged near the end of the ATC coverage area
Speedometer in a 0 series driver's cab, showing the ATC cab lights on top of the speed indicators
Henley branch line
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The Henley branch line is a branch railway line between Twyford in Berkshire and Henley-on-Thames in Oxfordshire. It was built by the Great Western Railway in 1857. Train services are provided by the present day Great Western Railway train operating company.
Henley–Paddington train at Slough
Henley-on-Thames railway station
The line to Henley at Wargrave station