What can a steam-powered brass band teach us about our place in an ever expanding universe? This film shoot saw us repeat a historic experiment, using trumpets and trains to shed light on how waves work, why sirens sound weird when they speed past us, and how we know that stars are moving away from us.

<iframe width="400" height="500" frameborder="0" src="http://www.bbc.co.uk/programmes/p05bxzhh/player"></iframe>