In the tunnel the bridge-profile rails were on longitudinal sleepers whereas in the platform sections conventional cross sleepers were used. “As a … A horror/sf film which will appeal to thoughtful viewers.  A formal excavation was conducted at the site of the upper station in August 1975. And it's not hard to dream up a dozen situations, whether natural disasters, man-made errors in judgement or acts of war or terrorism that could easily crack or break a structure like this. Removing wind resistance takes away a huge constant loss, but the energy needed for acceleration to high speeds is not affected, and not trivial. The Tunnel Cleaning Train includes a carriage with large vacuum nozzles that clean the tube tunnel as the train passes through. The Metropolitan and District railways both used carriages exclusively until they electrified in the early 20th century.  It operated for just over two months, and may have been a demonstration line for a more substantial atmospheric railway planned between Waterloo and Whitehall, construction of which was started under the Thames but never completed.  An arched brick tunnel 8 feet (2.4 m) high led from a below-ground chamber in the engine house to the side of the running tunnel. Could a design be developed whereby high level vacuum on has to be maintained around & ahead of the train, easing off once the train has passed? A brick tunnel, too small to be the running tunnel, and what is thought to be a retaining wall were found. Similarly light weight bridges could be used instead of massive expensive structures. The kinds of tube tracks we're talking about here would have to stretch thousands of miles in order to reach their optimum level of benefit – that's thousands of miles of safety risks. Transatlantic passengers on Concorde often referred to the supersonic plane as their “time machine” for its ability to land in New York two hours before it left London. We got interested in this after we laid a 1000-foot translucent pipe on a football field at MIT; we created a vacuum and shot tiny toy trains through it … , It has been rumoured that the site of the railway is haunted, a popular urban legend of the 1930s partially connected with stories surrounding Crystal Palace railway station. Another thought, and possibly daft - but if you can't maintain a vacuum, how about increasing the air speed in the tube? If so, it belongs in a discoid aircraft in space, not a tunnel under the ground. Another contender with an interesting take on the technology is Terraspan, a group that wants to combine superfast transport with the creation of a new intracontinental power grid that can make much more efficient use of the cycles of power creation and usage across a large country like the United States. Look,to all the naysayers.. they don't HAVE to go 4000 MPH.. the point of the article, is the same as all the 'popular mechanics' magazines of the 1950's that asked "if we have the capability of 100 miles per gallon engines, why aren't we building them?" On return journeys, the fan was reversed to create a vacuum to suck the carriage backwards, whilst the carriage used its brakes to come to a stop. A similar principle was applied to this railway, where a carriage fitted with a large collar of bristles was sucked along an airtight tunnel that measured 10 by 9 feet (3.0 by 2.7 metres). Note: edited for correct physics - thanks guys, you can always rely on Gizmag commenters to keep our facts straight! So where is vacuum-tube transport likely to go in the next few decades? The Metropolitan and District railways both used carriages exclusively until they electrified in the early 20th century. Experimental atmospheric railway that ran in Crystal Palace Park in south London in 1864. The London Underground opened in 1863 with gas-lit wooden carriages hauled by steam locomotives. Based on calculations by entrepreneur Elon Musk, who came up with the idea of a train that travels inside a vacuum tube, a journey between Manchester and … Mag-lev train lines themselves are exorbitantly expensive: Japan's Linimo HSST, a low-speed suburban mag-lev line, cost around US$100 million per kilometer (0.62 miles) to build. Would be nice to have more info on how they would generate the vacuum, and what quality would be required/maintained. And keeping a vacuum in that volume? Rammell included a curve of 8 chains (161 m) radius and a gradient of 1 in 15 (7 per cent) to demonstrate the capabilities of his design. This is 5–6 times the speed of sound in Earth's atmosphere at sea level. How can you hope to control a 4,000 mph airfoil within a tiny tube when the air pressure onset is sudden and unexpected? It's hard to say – although it seems extremely unlikely that a cash-strapped United States or European Union member would be willing to pony up and lead the way. , It is unclear what became of the line, as records do not state what happened after it ceased to operate, although it has been suggested that Rammell had originally constructed the small line as a test for a larger atmospheric railway that was to run between Waterloo and Whitehall. Is technologically within reach – so why is n't anybody building it track tube! Typically, that chute leads to a neighborhood waste collection center 5–6 the! 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