To add to posts #17 and #19 (from
@Pub and
@Statto respectively), there were loads of long Crosville routes, which still [broadly] exist in a shorter form.
The Chester - Rhyl service (then numbered A1/A2) that is still broadly run by Arriva (as an 11 with various suffixes) - though not following the exact same route - was actually shown in timetables as Chester - Rhyl - Llandudno - Caernarfon [then referred to as Carnarvon], so although passengers had to change in Rhyl, it was still considered one service, and through tickets were available from/to points either side of Rhyl. It was perfectly possible to travel from Rhyl to Caernarfon in the same uncomfortable rexene seat on an ECW bodied Bristol LD or FS until the mid 1970s, when that service was split into M13 Rhyl - Llandudno (some journeys extending to Llandudno Junction), and M5 Llandudno - Caernarfon. I did it once, but came back on the quicker, more comfortable, and much missed 'Cymru Coastliner' - a limited stop version that took a somewhat shorter route, whilst still linking the key towns along the coast.
Other long Crosville routes that spring to mind and are now split into shorter ones include:
B4 Chester - Mold - Denbigh A number of Chester - Mold routes exist, run by Arriva Wales and M&H Coaches, and a skeleton Mold - Denbigh service run by P&O Lloyd, but no through service.
C22/23 Meols - West Kirby - Chester A West Kirby - Chester service still exists, run by Al's Coaches, but not evenings or Sundays.
E29/30 Manchester - Alderley - Macclesfield No longer possible to travel directly from Manchester City Centre to Macclesfield by one bus.
H20-24 (each variation via a different set of suburbs / villages) Liverpool - Runcorn - Chester A number of Liverpool - Runcorn and Runcorn - Chester routes still exist, but there's no through service this way (although Liverpool is linked to Chester more directly via the Birkenhead tunnel by Stagecoach Merseyside's 1 / X1).
309/319 Southport - Ormskirk - St Helens - Warrington OK - technically not a Crosville route. Crosville had a minor share, as did Merseyside PTE in what was primarily a Ribble service, but nevertheless, there was a through service end to end, broadly hourly (even on Sundays!), together with numerous short journeys. Today, the Southport - Ormskirk section is part of Arriva Merseyside's 385, St Helens to Warrington is covered by Arriva Merseyside's and Link Network's 329 - the number given in the 1970s to some of the short workings Warrington - St Helens - Rainford, and the section between Ormskirk and Rainford (extended at each end to give a token through Southport - St Helens service) is covered by a two hourly Merseytravel / Lancashire County Council tendered service numbered 152, presently operated by Huyton Travel. But on Sunday's, you're walking that section between Ormskirk and Rainford!
A more recent example, I guess, is the 19 - Llandudno - Betws-y-Coed, presently operated by Llew Jones Coaches. For very many years, there was an M19 (and M20 variant) Llandudno - Llanrwst service, operated broadly hourly by Crosville, so it could be argued today's service is the very opposite of what's being asked for - it's an extension. However, in Arriva days, the service was extended from Betws-y-Coed for a couple of years in the 2000s to reach Corwen - pretty much in the way that the T10 now operates - and onwards to Llangollen, so it's a shortening of that service. I'll let the pedants decide whether that counts or not!