Examining historical date from the ONS, which is used to compile the CPI and RPI inflation measures, UK train and bus/coach fares have all increases inline with each other since 1987. Bus/coaches slightly ahead, as show in the char below;
Chart of Bus and Coach Fares vs Train Fares since 1987, from www.inflationarypressure.com.
However since 1990 bus/coach fares have increases faster then RPI, see chrt below, but does this tell the whole story!
Chart of Bus and Coach Fares vs RPI Inflation Measure since 1987, from www.inflationarypressure.com
Historically UK train fares increased in l