Light rail systems are experiencing a revival in several countries in the world. Nevertheless, they arefacing a more and more demanding market which implies continuous new evolutions and technologies.An example of this fact is related to the requirement of avoiding visual intrusion in some areas of citieswhich are more sensitive to visual impact.This fact has led to the implementation of new solutions that try to avoid the need for overheadcontact wires through the whole network or through the lengths between stations. These solutions arebased, generally, in the use of new embedded third-rail systems; the use of on-board energy storagedevices; or the use of electric energy produced on-board the vehicle.This paper is focused in the explanation of these technologies, their applicability, as well as theiradvantages, risks and inconveniences, in an attempt to clarify available options and their reliability.
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