I4

==Rainbow R2/R4==
===1993-2001===
Before I4, it was split into two different Rainbow routes; R2 and R4. R2 terminates in Sandiacre along with R4, but, R4, however, terminates in Derby.
== Rainbow 4 ==
===2001-2005===
R2 and R4 got merged together to make Rainbow 4, with buses running every 10 minutes and a low floor interior.
===2005-2012===
After the big merge of Trent and Barton companies, Rainbow 4 finally got an upgrade in 2005 with more seats and real time information, powered by Star Trak.
==I4==
===2012-2018===
Before Trent Barton's refurbishment, Rainbow 4 got a new name with new looks. These buses were shown in 2011, but, hit the road as the first route in the new livery in 2012.
===2018-present===
Category:1993
Category:2001
Category:2012
Category:Trentbarton