A Question guaranteed to make you Smile then Feel better.
Okay here goes.;
I don't care if you ever had a train set. I don't care if you are a Rail-Fan ( Well you probably know the answer anyway). Way back when we were kids our parents said "Oh, look there's a Choo-Choo!" Guess what? their parents said that to them too!
AdInfinutum. Back to the dawn of regular train use. Whatever they were called. WHY???
Here's the answer. I was watching a video on a Baldwin Locomotive.( One of the more well known common ones. They are identified here in the states by wheel arrangement.One with two wheels under the Firebox( Back by the Cab) and eight wheels driving Four on each side and Four Small ones up front near the Cowcatcher( Or Pilot) are called Two -Eight Fours.
When a steam train moves it's the piston in the steam box( that big black thing up front) just behind the four small wheels, that sets everything in motion. The piston moves the drivers which moves the wheels.Technical ain't it? Well, to simplify it.Why the Choo - Choo Name?
In that steam Box is a sliding valve. When the rod presses forward the back end spits out a stream of steam. CHUFF or CHOO! Then when it slides Back A stream comes out the front, CHUFF or CHOO! When this gets the wheels moving good, you get, Chuff-Chuff or to an untrained ear Choo-Choo!
Yes. Many times it's the smoke coming out of the stack that's synchronised with the drivers when it's usually up to speed because everything is going so fast. Thus you actually then get Choof-Choof. Amazing isn't it. One little (Well, not that little piece of machinery working like it's supposed to) can make us refer to a machine a certain way isn't it?