While there, I decided to clarify an ambiguous statement about pneumatic postage stamps (which were mentioned here previously). Of course, I had to also add a picture of one of the stamps.
Then I had to move a misplaced paragraph listing some occurrences of pneumatic tubes in fiction from the postal section. I put it in it's own section and expanded on it:
When pneumatic tubes first came into use in the 19th century, they symbolized technological progress and it was imagined that they would be common in the future. Jules Verne's Paris in the 20th Century (1863) includes suspended pneumatic tube trains that stretch across the oceans. Albert Robida's The Twentieth Century (1882) describes a 1950s Paris where tube trains have replaced railways and pneumatic mail is ubiquitous. Edward Bellamy's Looking Backward (1888) envisions the world of 2000 as interlinked with tubes for delivering goods. Michel Verne's An Express of the Future (1888) questions the sensibility of a transatlantic pneumatic subway. In Michel & Jules Verne's The Day of an American Journalist in 2889 (1889) the Society for Supplying Food to the Home allows subscribers to receive meals pneumatically.
Later, because of their use by governments and large businesses, tubes began to symbolize bureaucracy. In George Orwell's Nineteen Eighty-Four, pneumatic tubes in the Ministry of Truth deliver newspapers to Winston's desk containing articles to be "rectified". The movie Brazil, which has similar themes, also used tubes (as well as other anachronistic technology) to evoke the stagnation of bureaucracy. At the start of each episode of the 1999 television series Fantasy Island, a darker version of the original, bookings for would-be visitors to the Island were sent to the devilish Mr. Roarke via a pneumatic tube from a dusty old travel agency, making the tube seem not so much bureaucratic as sinister.
The failure of pneumatic tubes to live up to their potential as envisioned in previous centuries has placed them in the company of flying cars and dirigibles as ripe for ironic retro-futurism. The 1960s cartoon series The Jetsons featured pneumatic tubes that people could step into and be sucked up and swiftly spit out at their destination. Futurama imagined similar devices for the citizens of 31st century New New York.
But, sometimes a tube is just a tube, and not all pneumatic tubes in fiction are symbolic or meaningful beyond simply being interesting technology. In the James Bond film The Living Daylights, a supposed Soviet defector was smuggled across the Iron Curtain in an oil pipe-line. While not technically a pneumatic tube, the design of the transportation system in Logan's Run, in which cars traveled in elevated clear tubes, seems influenced by pneumatic tube aesthetics.
So, if anyone knows any other notable pneumatic tubes in fiction that I missed, please add to the article.