Yes, the Wiki article seems to suggest that the lack of easily placeable stations may be a problem.
Ooh, from the Wiki:
"The concept of transportation of passengers in pneumatic tubes is not new. The first patent to transport goods in tubes was taken out in 1799 by the British mechanical engineer and inventor George Medhurst. In 1812, Medhurst wrote a book detailing his idea of transporting passengers and goods through air-tight tubes using air propulsion."
Definitely a steampunk/hyperloop variant waiting to be written there!