In 1999, Dudley Port saw the passage of over a hundred scheduled, loco-powered runs per weekday.

Loco-haulage. A relentless stream at Dudley Port canal junction in 1999.
We're now deep in the era of “bespoke trainspotting”. We usually know what's coming before we leave home, and we can monitor the journey(s) of the train(s) so that we don't have to wait around long at the location. For some, “bespoke trainspotting” has been the norm since the Blackberry era of the early to mid 2000s. For others, decades earlier. I can remember advance summer Saturday gen being shouted out from a soapbox on Sheffield station in 1981 - to a large and very captive audience, and a round of applause.
So gen, and the bespoke activity it encourages, predated the Internet by a long time. But until the early to mid 2000s, we didn't actually need to know precisely what was happening in order to head off for an enjoyable spell at the lineside. Before that, the general UK rail traffic - the normal - carried inherent interest.