The Solari-style mechanical split-flap boards of railway stations and airports, 1960s–2000s — each character settling into place with a click. Browse the preset messages or type your own.
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About the boards
Split-flap displays were invented by Solari di Udine, an Italian company that installed the first units at Milan Central Station in 1965. The mechanism is elegantly simple: each character position holds a stack of semi-circular cards mounted on a rotating drum. The drum advances one position at a time under a spring or motor, each card falling under gravity with an audible click. Because the drum can only move forward, reaching a character always means cycling through every intermediate character first — which is why a board updating produces that characteristic cascading rattle rather than all characters changing simultaneously. The simulation above works the same way: each tile advances forward through the full character sequence to reach its target, and only tiles whose content actually changes animate at all.
The sound of an airport departure board updating became one of the defining sensory signatures of mid-20th-century travel. At Heathrow, Victoria, Paddington, and hundreds of other stations, passengers gathered beneath these boards and watched destinations resolve into certainty, character by character. The physical process of information settling into place was visible and audible in a way that a silent LED or LCD refresh is not. There was also an honest uncertainty to it: for the brief moment when characters were cycling, you did not yet know what the destination would be.
Schiphol Airport in Amsterdam retired its last Solari board in 2016; it is now in a museum. A few survive in active service — notably at Hoboken Terminal in New Jersey and at a handful of European stations maintained as heritage installations. They were not retired because they wore out; they were retired because their successors are cheaper. Not better at the thing the boards did — just cheaper.