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Portsmouth - St Malo is another one for those who enjoy dramatic port departures and arrivals. Travelling with Brittany Ferries is always enjoyable too.
I enjoyed Lausanne - Evian back in the late 90s when the onward trains from Evian were a completely random assortment of ancient dark green UIC and USI stock.
It’s a slightly odd suggestion but what about Lower Sydenham? It’s surrounded by a surprisingly industrial area for an outer London suburb and a fair hike from anything residential.