In 1994, The Two started off as Double 2, with buses running every 15 minutes.
The yellow numeral 2 was replaced with a red numeral 2 with a yellow outline and a die on it.
Double 2 now goes yellow as of 2004, introducing a new Rainbow route, Rainbow 2. The frequency of every 12 minutes replaced the 15 minute frequency and introduced the low floor buses.
As of October 25, 2015, The Two gets bigger buses, with: more seats, fast 4G wifi, USB sockets, audio stop announcements and a new frequency of every 10 minutes, instead of 12 to improve reliability.