Well TDK I lived in Rhyl for many years,and still travel there by train,its not a major holiday resort any longer,four up trains an hour between 1500 & 1600 in February does not display crowded platforms, the train I returned on the 1508 had myself and one other on the platform,this was the ATW following the 1500 VT.
To be fair, there are four up trains between 1500 & 1600 because of the Virgin service to Euston at 1500, which does not run hourly, and the timetable pattern of ATW's Llandudno-Manchesters changing to provide an extra peak-hour Manchester-Chester service at 1719.
Go forward to the next hour to 1600-1700, and you find only two up trains!
Indeed, the standard basic timetable is two trains per hour - x12 to Manchester and x41 to Cardiff/Birmingham, with 7 extra Virgin services to Euston/Birmingham added at irregular times throughout the day.
P.S. I didn't intend to duplicate
cymro inside's post - I've only just noticed it, and so hadn't read it before making this!
As for Rhyl no longer being a holiday resort, there might not be as many of the bucket-and-spade variety on the sands, [and they certainly can't visit the Pavillion or stroll on the pier any more], but there are still many holiday-makers using the caravans and holiday camps on the coast between Abergele and Prestatyn, and visiting Rhyl. Enough to justify Arriva Wales buses running an extra half-hourly open-top service along that stretch of coast in the summer months.
And a good many of these still use the station at Rhyl during the summer months, when the normal twice-hourly 2/3 car services become very cosy indeed!
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It's not just in the afternoon that there's some off peak tail chasing down the coast it's a problem generated by having two operators wanting to path trains over the whole length of a route and the "political" nature of needing north to South Wales trains. Around a quarter of the ATW services could be thinned out without any detrimental effect to the overall market if time tabling with VT was coordinated.
True - the timetable could be tidied-up if ATW and VT co-ordinated their services on the Llandudno Junction-Chester section.
But I doubt that could happen[except perhaps on Sundays, when the only four up trains from 1140 to 1526 are provided by VT [ATW crews enjoying a long Sunday lunch!], because of VT being constrained by available slots between Crewe and Euston on the WCML, and ATW having a similar constraint through the busy Ordsall Lane /Piccadilly section of their Manchester service.