I'm answering in two halves and may split this part into a new thread. The term "Estimates of Station Usage" can be misleading and is worthy of general coverage. And, yeah, Melksham (
MKM» ) is a good example.
Sorry - just seen "analysis to follow".
And people can't travel on cancelled trains.
Ah right - I just thought they based it on the town's predicted population growth; didn't realise it took factors such as this into account.
It's nothing directly to do with the population. It's based on ticket sales. If I buy a return from Melksham to Sugar Loaf (yes, I have done) it counts a2 2 journeys for Melksham - 1 arrival and 1 departure, and 2 journeys for Sugar Loaf - again 1 arrival and one departure.
Simples - except
1. If I buy a season ticket, how is it counted? For a week's season, I think it's five return trips each way, end to end. So a week's season ticket Melksham to Swindon adds 10 to the headline figure for each of Melksham and Swindon. The fact that on Thurdsday, my partner dropped me off at Chippenham in the morning so it should have only been 9 and 1 for Chippenham is not recorded. And the fact that I took a train on the season on Saturday (one that was running) up to Chippenham to meet the station friends isn't counted. For longer seasons, there's algorithms to work out the numbers based on expected holidays etc
2. If I buy a split ticket - e.g.Melksham to Didcot and Didcot to London and back it should be 2 for Melksham and 2 for London, but it ends up as that plus 4 for Didcot - so much of an issue these days that adjustments are made.
3. At one time, Melksham to Bristol was cheaper than Bradford-on-Avon to Bristol and an awful lot of "Melksham Specials" were sold to people going nowhere near Melksham. So much of an issue that at one time I'm pretty sure that it accounted for two thirds of the Meksham ticket number. To this day, I will buy an off peak Melksham to a Severn Beach line station return to go to Temple Meads, and for Melksham to Trowbridge it's cheaper to buy a Westbury ticket
4. Go to London and the ticket is "London Stations". So from Melksham, it's Paddington. Probably, but it could be Waterloo or Victoria
5. My trip to Sugar Loaf? No - it wasn't. It was to Llanshamlet, out the long way round via Craven Arms, week's work for
DVLA▸ with a break of journey at the nearest station to them
6. What about rangers, rovers and freedom tickets?
7. It's ticketed journeys counted, so if there are any fare evaders they ain't counted. Which is probably fair enough because really the future train service levels shoudn't be based on the defrauders.
So, you see, estimates. Internally, the data is there between every pair of stations is available - not yet for the year to '24 thought - see
http://www.firstgreatwestern.info//flows.html?stn=MKM and the grand total number is the same.