More people have cars too though. Working on gut here rather than having checked any figures, but I'd wager that the proportion of rail journeys compared to car/bus journeys, for any given distance long/med/short, has fallen.
I thought this was an interesting question, so I looked it up. I don't have figures going back to the 1990s, but I've looked at the DfT's dataset on modal share NTS0409 [1] which has data 2002-2018.
Looking at number of trips/head, surface rail was 13 in 2002, rose to a pre-pandemic peak of 22 in 2018 and fell back to 15 in 2022. Bus (London + non-London local + long-distance) was 74, 48, and 37 respectively; motoring (car driver + car passenger + motorbike + taxi) was 694, 614, 512. Overall was 1074, 986, 862. So rail had a modal share of 1.2%, 2.2%, and 1.7% in 2002, 2018 and 2022.
The distance measure looks similar for rail: 482, 683, 493, from 7193, 6530, 5373. Modal share 6.7%, 10.5%, 9.2%. (I haven't done separate sums for buses and motoring.
So at least since 2002, it looks like rail has had a small but growing modal share of a steadily declining travel market, until disrupted by Covid to a place below peak but still considerably ahead of where it started.
Caveats: I haven't included the tube, and these data don't disambiguate light rail systems from 'other' (including flights). Rail remains dominated (like bus travel) by London & South East commuting, at least in number of trip terms.
