find example of real time information system short blog including link and screen shot.
London Underground Train Times
London underground have a real time time information system as they have a real time map of all underground train routes. Real time means that the map is updated regularly to any change that has occured on the underground. The map shows how well all train journeys are flowing and are able to show you if there are any lines closed, severe delays or minor delays in real time so that people can see if they expect the train to arrive on time or not or not to arrive at all. This makes it helpful to costumers as they know important things in advance.

http://journeyplanner.tfl.gov.uk/im/RD-T.html

Screen shot of real time London underground map.