Atmospheric railway uses air pressure for propulsion. Depending on the model, it either runs on a tube that sits between the rails which is connected to the train via a suspended piston, or the car itself acts as the piston with the tunnel acting as the tube. Engines set up along the trainâs route leave a partial vacuum just ahead of the car, while pumping air behind the car, causing atmospheric pressure to boost the train. As the name suggests, atmospheric railways eliminate friction and jerkiness, and are nearly silent. In the mid-1800s, Dublin, London, Paris all operated these trains.
For their first 25 years, railways were marred by the âwar of the propulsion systemsâ. Â On one side were George and Robert Stephenson, who pioneered the railway locomotive. Â Opposing them was Isambard Kingdom Brunel who favoured engine-less trains.
Brunel thought that attaching a heavy locomotive to a train was crazy: the engine had to haul its own weight, a substantial railway was needed to bear the combined weight of train and engine, and the steam engine made for a noisy, smoky and rough ride. Â It would be faster, cheaper, safer and more comfortable to generate the power elsewhere with a fixed engine, transmit the power to the railway, and run a lightweight train of carriages on a correspondingly lightweight track. Â You can see a certain logic to his argument.
A train without an engine! Gliding silently through the countryside on what appeared to be a largish drainpipe between the rails.Â
During the Spring and Summer of 1848, nine trains a day were running at average speeds of 64mph (a top speed of 70mph) and the Atmospheric Train was a firm favourite with the passengers â except perhaps those in third class who had to get out and push if there was a breakdown!Â
Atmospheric railways are back. A Brazillian inventor Oskar Coester designed a new system in the 1970s. The Aeromovel Corporation built several air-driven âpeople moversâ in Brazil and one in Indonesia (pic 1)
Brunel's atmospehric train was recreated as a working model at The Barometer World in 2003 (Pic 3)
Pic 1 : Travelinked.com  Pic 2: Weird & Whacky Railways
Pic 3: Barometer World News