I've heard Amiga's were used on the Sydney monorail, not sure in what capacity (its been discussed else where on here). I think they were also used in Sydney or Brisbane (cant remember which) to display train times, an Amiga user on here actually sent me the program that was used, still got to check it out.
A colleague of mine here in Adelaide said a hotel here used a C64 on the reception desk well into this 2000's. It ran a small guest database.