There are many slang terms used to describe such cars, such as jalopy, beater, clunker, hooptie, old banger (most commonly used in the UK), but the most popular being junk car.
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In England it's a Garage, in Scoland its a “car Hoose” in Wales it called a “sheep shed with an up and over door” and in Northern Ireland it's a “Wee cold place to keep kids bikes and other stuff”
The famous London taxis are actually called 'hackney carriages' but in London we just call them 'black cabs/taxis'. London taxi drivers have to pass a special exam called the Knowledge to get their license so if you take a black cab, you can be sure the driver will know the way.