A good example would be Supertram - the Sheffield tram service. It's only ever provided service disruption notices on twitter. The stations have digital signs w

A good example would be Supertram - the Sheffield tram service. It's only ever provided service disruption notices on twitter. The stations have digital signs which they installed years ago and have always been completely flawed in that they cant actually update them remotely, nor can they say if a tram is running late. They just play a fixed playlist on a loop.