This is the third part of a 1936 documentary film about a mail train traveling from London to Scotland. Be sure to watch the mail exchange process that starts about 50 seconds in.
The train doesn’t even slow down to exchange the mail…the outgoing mailbags are hung low and snared by a net near the track and incoming mailbags are collected up high using a similar net.
Drive-through fast food should work more like this. (via sveinn)