A few people also mentioned enjoyable & interesting rail journeys ... I'm not fond of the idea of a 'community thing', because that's how you end up making a big performance out of things, but here's a few examples:
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southeasternrailway.co.uk/destinations-and-offers/popular-kent-destinations/canterbury/ - whizz from St Pancras to Canterbury, take a stroll along the banks of the Stour and enjoy the cathedral
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lner.co.uk/our-destinations/popular-destinations/trains-to-york/things-to-do-in-york/ - take a trip at 125mph from Kings Cross to York. Make sure to spend an hour or two in the National Railway Museum near York station, and take in York Castle and the city's Viking history exhibits afterward
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avantiwestcoast.co.uk/where-we-go/destination-guides/lake-district/ - journey through the Dales into Oxenholme, and go mountain biking through the gorgeous natural scenery of the Lake District national park
~sleeper.scot/destination/ftw/ - take the Caledonian Sleeper to Fort William, then change onto the
westcoastrailways.co.uk/jacobite/steam-train-trip/ Jacobite steam train that'll take you over the Glenfinnan viaduct
...in fact, take a browse through
scenicrailbritain.com/, they've done a far better job in greater detail than I could, with recommended itineraries as well. Here's a couple of examples that stick out to me:
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scenicrailbritain.com/settle-carlisle/ - the Settle to Carlisle Line, for the Ribblehead viaduct
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scenicrailbritain.com/lines/st-ives-bay-line - the St Ives Bay Line will take you to the sandy beaches of Cornwall - I'd also recommend taking the Night Riviera sleeper train from Paddington to Penzance to begin.
Meanwhile, if you're a simple man and you want to ride on a real 'choo choo' steam train, take a look at
railadvent.co.uk/steam-locomotives-on-the-mainline/, and there's an option to include preserved diesel locos as well. These guys also offer railtour 'experiences':
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westcoastrailways.co.uk/railtours/~
ukrailtours.com/~
saphostrains.com/