What is the power source for trams?

Most light rail or tram systems get their power from overhead catenary systems. Typical voltages range from 600V–750V DC, with more recent installations tending towards higher voltages. These voltages are lower than those used by traditional electrified railways, which use much higher AC voltages up to 25 kV.



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Most light rail or tram systems get their power from overhead catenary systems. Typical voltages range from 600V–750V DC, with more recent installations tending towards higher voltages. These voltages are lower than those used by traditional electrified railways, which use much higher AC voltages up to 25 kV.

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Trams draw their power from a single overhead wire at about 500 to 750 V DC. Trolleybuses draw from two overhead wires at a similar voltage, and at least one of the trolleybus wires must be insulated from tram wires.

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DC voltages between 600 V and 800 V are used by most tramways, trolleybus networks and underground (subway) systems as the traction motors accept this voltage without the weight of an on-board transformer.

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The advent of personal motor vehicles and the improvements in motorized buses caused the rapid disappearance of the tram from most western and Asian countries by the end of the 1950s (for example the first major UK city to completely abandon its trams was Manchester by January 1949).

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Tramlink in line with most tramways is powered at a nominal 750 vdc. Peak Power Consumption is 1MW in any section.

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Trams running on solar power A unique connection between the eco solar park 't Oor in the Dutch city The Hague and the power grid of regional operator HTM allows trams of Randstadrail 3 and 4 to run on solar power. There are 4,700 solar panels installed, producing over 1.4 Gigawatt hours per year for the trams.

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Trams cannot go around obstacles, they don't mix well with bikes, they take up too much space and “they cost a fortune,” as Washington DC can tell you.

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Low Carbon Emissions: Trams have minimal carbon emissions making them an ideal option for eco-conscious individuals. Not only do they produce less pollution but they also emit less greenhouse gases into the atmosphere. Efficient use of Energy: Trams run on electricity which makes them highly energy efficient.

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Together the two are multiplied together to give the drag area. 0.8 x 12 = 9.6 for a double decker bus, compared with 0.3 x 6 = 1.8 for the tram. This, combined with the rolling resistance, means a trams energy expenditure once up to speed is a fraction of that of a double decker bus.

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But the trams had become a political football (in Leeds it was Labour that did for them, in Liverpool it was the Conservatives). They were unwanted clutter from the past at a time when operating costs of public transport networks were rising and meeting housing targets was the big priority for investment.

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