Real time general transit feed specification: a way to follow transit vehicles real time

Using GTFS-RT, the current positions of transit vehicles can be monitored. Originally, the G in GTFS stood for Google. It initially started out as a side project to incorporate transit data into google maps in 2005. Since then, it has become the de facto standard to represent transit information. Due to its wide use, the G in GTFS was renamed in 2009 to General to prevent people shying away from using the standard.