In a 14 minute talk from Radio Australia's Ockham's Razor series, retired chemist Dr Trevor McAllister looks at the history of the tram, from the first horse-drawn service to the technology that has created the electric trams.
Download the 6.8 Mb mp3 audio file or read the Transcript.
Image: once again a familiar sight in central Christchurch, is this vintage tram being removed from a New Brighton garden in 1969.
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