TrainTravel.co.ukThe Kent & East Sussex Railway explains the Doppler effect
A recreation of an experiment revealing the nature of the Doppler shift, filmed for BBC2's Horizon programme in 1978. Kent & East Sussex Railway A1X Terrier 0-6-0T No.10 'Sutton' is seen hurtling between Rolvenden and Wittersham with an unusual train consisting of a drop-sided wagon and brake van. Oh, and a sextet of Salvation Army trumpeters all playing middle C. What would the Health and Safety wallahs would make of this today? They're not even wearing hi-viz waistcoats!
Historical note: It was Dutch chemist and meteorologist C. H. D. Buys Ballot who tested the Doppler effect for sound waves by using a group of musicians playing a calibrated note on a train on the Utrecht-Amsterdam line in 1845.
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