Earlier today I spotted an interesting set of stats in the
ORR» 's National Rail Trends - Chapter 7: Regional usage profiles. The pdf is here
http://www.rail-reg.gov.uk/upload/pdf/rolling-c7-rups-v1.pdfIt breaks stuff down into the regions, such as South West, South East, West Midlands, Wales, etc, but also gives a ballpark passenger journeys figure for each county or unitary council area in 2007-8 and the increase (or fall, though this mostly seems to affect journeys to and from Scotland, presumably down to the effect of cheap flights) this represents since 1995-6.
I'll leave it to you to pick out the bits you are interested in, but one striking thing in the South West stats is the explosion in rail traffic in Bristol, Bath and the surrounding areas since 1995. So, just to stir the pot a bit, were the civil servants who invented the county of Avon right after all? Does the area need an over-arcing body to look after transport matters? A passenger transport authority at the very least?