However, in the case of TPE and Bolton it does if you board a northbound service with a Bolton ticket:
a) You risk having to buy a new ticket
b) You won't be informed if the train is to miss out Bolton for some reason so it might go straight to Preston where you might encounter some RPIs in possession of a Manchester-Bolton ticket.
That is often quoted but it is a matter for some debate, I don't know (perhaps someone else does) if a prosecution on the matter has ever succeeded. I did hear that on the Great Western they used to deliberately miss the stop out sometimes to catch people out (and in such a case a prosecution would succeed, as they had overtravelled). But in practice, as the objective is simply to reduce overcrowding, not advertising it on the displays and journey planner as calling there is sufficient to reduce overcrowding, even if the odd smart-alec commuter does work it out (as I believe a few do on peak VTs from Euston that "don't" call at MKC).
I agree with Neil that omitting the stop from PID’s may discourage the non-cognoscenti and that the cognoscenti will quickly learn to game the system. I believe we can dismiss the idea of skipping a stop as almost invariably passengers board at Bolton heading north. Indeed, you might recall the Boltonian huffing and puffing when the “Scottish Connection” was broken by the spiffing wheeze of sending electric trains via Chat Moss. The burghers of Bolton would not simply countenance skipping their station. The other dimension is that this is a unidirectional problem in that southbound Bolton passengers have to stand on that the last stage of the journey from Scotland – passengers from points north already being seated. In the opposite direction passengers to Bolton are competing for seats with passengers who are travelling further north – in particular those with seat reservations. In the mayhem that is peak time boarding at Oxford Road the seat reservation system collapses as a bum on seat free for all regime applies. On many occasions you can only get to your reserved seat after Bolton and on certain trains Chorley.
I accept the point that Brother Collins makes about the time constraints on the guard between Salford Crescent and Bolton but when the train is full and standing from Oxford Road he is often exiled to the back of the train because all access routes are full of standing passengers. I suspect that crowding on Salford Crescent also makes it necessary from him/her to be at the back of the train reliant on the station staff to supervise loading in the middle and the front.
One other point. IIRC GM Travel Concession Card Holders don’t require a ticket so how are you going to have printed on the back “Not valid on TPE etc,” Guards have better things to do with their time.
Unlike Wigan where the omission of a stop on the 17.XX off the airport does not matter because there will always be two trains to Scotland running close behind having originated in Birmingham or London – in Bolton that option is more restricted and might involve a change at Preston.
Given therefore that restricting northbound Bolton passengers other than by smoke and mirrors/PIDs is not a viable solution – why should TPE give up their share of the ORCATS money
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I have visited Manchester many times over the last few weekends, and it's certainly noticeable that on-board ticket checks happen either directly before or after Salford Crescent whilst not so common afterwards. Checks after Bolton are uncommon: after Lostock non-existent
That might be the case at weekends but during the weekday evening peak, my experience is that there is always a ticket check between the airport and Piccadilly a second between Oxford Road and Chorley and presumably further checks north of Preston after we both will have got off.