Stations in the area of direct influence / control of Wiltshire County Council (so Swindon NOT included):

Avoncliff
Bedwyn
Bradford
Chippenham
Dean
Dilton Marsh
Melksham
Pewsey
Salisbury
Tisbury
Trowbridge
Warminster
Westbury

Four questions:

a) Which of these stations has the largest popution living within 10km of the station?

b) Which of these stations is the only one with close access off the A350, making it suitable for upgrading to a park and ride?

c) Which of these stations showed the highest growth in percentage terms from 1996 to 2006, based on the county's passenger counts? 

d) Which of these stations have the lowest number of passengers leaving / joining the trains each day in proportion to the number of people living within 2 km? 

(Here is a clue on (c) - the growth rate figures quoted for the stations are as follows 1.70 1.70 1.57 1.40 1.68 2.92 6.58 2.06 1.61 1.73 2.10 1.51 and 1.42 so that the lowest growths in the 10 years are 40% and 42%, and the highest is 558%. Can you match the station with the growth?)

(And a clue / comment on (d) - a figure of one passenger journey per 30 residents is typical - 10 of the 13 stations are close to this line on a graph. None is far above the line, but one station is especially a long way below!)

The serious point - attention should be priroitised on those stations which show heavy growth, have good access, and have  many residents nearby.   Further attention should be focused on station(s) where the passengers carried falls well below the number one might expect based on the catchment area

I suspect we're coming at the same thing from different angles; each will have an individual set of options / solutions.  My statement may look confusing because I know the answer and (!) the answer to all 4 questions is the same station.