The newest tram in Hungary's capital Budapest has been unveiled: a full-size rail vehicle made of 1.8 million colourful LEGO blocks, the first of its kind in the world.

The seven-tonne, 11.5-metre-long LEGO tram, unveiled in Budapest on Wednesday, took 90 people nearly 7000 hours to build over two months.

It is part of a collaboration between LEGO Hungary, the city of Budapest and the capital's public transit company, BKV.

Budapest’s public transport network is largely based on its extensive tram network.

The city’s first tram line was open for the public in November 1887.

While the full-size LEGO tram will not carry passengers and does not have an engine, it will be on display in the city's central square until December 20 to promote sustainable transportation.

Life-size LEGO cars have been made before, but a full-size tram has never been built anywhere in the world, representatives of the LEGO factory said. 

Volunteers used 4.5 tonnes of plastic blocks to build the tram, but the weight of the entire tram is much more as the steel chassis alone weighs 2.5 tonnes.