Generate text that refutes this claim: There have been similar suggestions before for intercity travel  The Hyperloop is not the first proposal to use tubes with low – or no – pressure in them. A very high speed train was proposed by Robert M. Salter in 1972. This as a train running in a vacuum would have gone substantially faster than anything that is currently being proposed travelling at around 3000 mph. [1]  Nor is this the first proposal for a pneumatic transport system; such trains were around in the 19th century. They were first proposed as far back as 1812 [2] and several short demonstration tracks were constructed such as the Beach Pneumatic Transit in New York which opened in 1870. [3] Such idea has not got off the ground in the past and there seems no reason why they should now when the basic technology is pretty much the same.  [1] Salter, Robert M., ‘The Very High Speed Transit System’, RAND Corporation, 1972,   [2] Medhurst, George, ‘Calculations and Remarks, Tending to Prove the Practicability, Effects and Advantages of a Plan for the Rapid Conveyance of Goods and Passengers: Upon an Iron Road Through a Tube of 30 Feet in Area, by the Power and Velocity of Air’, D.N. Shury, 1812,   [3] Mihm, Stephen, ‘New York Had a Hyperloop First, Elon Musk’, Bloomberg, 14 August 2013,
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That there have been similar suggestions before does not mean they are not commercialisable today. The very high speed trains are an inspiration for the Hyperloop but have serious disadvantages by comparison. Because of their vacuum tube the system would be stopped at the slightest leak. [1] They are also astonishingly expensive with the cost associated with construction estimated at as high as $1trillion, the hyperloop is much more economic and therefore practical.  [1] Musk, Elon, ‘Hyperloop Alpha’, SpaceX, 12 August 2013,  p.3