Fun fact, there were originally plans to build entire city networks of those pneumatic tube delivery systems until the USPS decided it would be too much fun (as well as bypass their mail delivery monopoly). They successfully convinced congress to ban them in any situation where they could compete with delivered mail (basically, they can't run between any two addresses).

After email killed off intra-office mail, banks are one of the last viable economic uses for pneumatic tube systems.

Still bums me out.