Rail signal arrangement for a rail signalling system

摘要

A rail signal arrangement for a rail signaling system comprising: a rail signal (102) having a rail signal lamp (112A-112C) comprising a plurality of light emitter sub-arrays each comprising a light emitter or a plurality of light emitters connected in sereies, wherein the light emitter sub-arrays are electrically connected in parallel, and a control circuit, wherein the control circuit is configured to: operate the rail signal lamp in response to operating instructions from a remote operations management system, detect the proportion of light emitter sub-arrays that are in an operable condition with a monitoring system, and provide a condition status signal to the remote operations management system in accordance with whether the proportion of light emitter sub-arrays in an operable condition meets a minimum threshold level. The light emitters may be LEDs and the monitoring of the light emitters may involve either measuring the light emitted with a photo-detector, or measuring the current flowing through the sub-arrays,