APS: Service-proven catenary-free tramway operations

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At Alstom, we value curious and innovative people who are passionate about working together to reinvent mobility, making it smarter and more sustainable. We are building an agile, inclusive, and responsible culture, where diverse people are offered opportunities to learn, grow and advance in their careers, with options across functions and geographies.
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Learn moreAPS at a glance
APS is a highly reliable power system that reduces the footprint of light rail lines and preserves the aesthetics of urban environments.
Cities planning a tramway can today preserve their historical heritage and urban environment by dispensing with obtrusive overhead contact lines. Alstom’s APS ground-level power supply system is a proven alternative with equivalent performance which is currently operating in seven cities on three continents and offers safe, reliable power to trams whether in short catenary-free sections or along the entire line.
Inspired by ‘third rail’ feeding systems present in metros, APS uses 11-metre segments set into the track bed between the guiding rails to supply current to vehicles. These segments automatically switch on and off according to whether a tram is passing over them, thereby eradicating any risk to other road users. This safety principle was certified by several competent bodies all over the world.
Trams running on APS can also incorporate overhead line equipment and/or traction batteries, with simple and easy transition between power sources. If a line is extended, it is easy to extend the APS system with it. In addition, APS comes in two versions according to the climate encountered: a standard version for temperate atmospheres and a tropicalised version for extreme climate conditions, withstanding ambient temperatures of up to 55 °C.