Puffing Billy

At http://malagabay.wordpress.com/2015/06/04/the-soporific-sound-of-settled… … if you like choo choo trains and puffing billies have a look at Tim Cullen's post this week. He uses videos of steam trains to make a point about the Doppler Effect. I used to watch the steam trains from the West Country roar through our neck of the woods when I was a boy, rocking side to side as they sped on their way to London. They used to stop feeding the boiler at around West Drayton, and had enough momentum to reach Paddington.