Signal circuits are an important part of the interlocking system. The main role of the signalling circuit is to switch the required signal aspects and signal checking. A signal is an interface between the interlocking system and a driver of the railway vehicle. Light bulbs are mostly used as a light source in most types of interlocking systems. It is possible to think about alternative light sources within the context of modernisation of the interlocking systems. The use of alternative light sources using must not cause signal circuit safety degradation. The article deals with problems of light bulbs replacement for another light source in AŽD 71 type relay interlocking in the Railways of Slovak Republic.
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