The UK. Lines interconnect all over. But that doesn't mean connections are possible when you want them and don't involve time padding and risk of not making them and sometimes completely illogical routes, and even with one of the world's highest densities of stations many places people want to go to don't have a station particularly nearby or a last mile solution that isn't a taxi. And no matter how good the end-to-end connections are, they're not suited to any journey involving non-trivial amounts of luggage. Compromises you may have to make include adding extra hours or overnight stops to journeys, taxis for the last mile or twenty, not having more than one bag's worth of luggage, or spending a lot more money than the equivalent journey by car even without the taxi/hotel bills. And not travelling at all when the rail workers are on strike, like today
There are certain things train services are excellent at, like serving people's daily commute at predictable times into a congested city centre (with the caveat crowded trains aren't necessarily a pleasant experience) and letting you travel whilst drunk or putting the finishing touches to your presentation, but they're not going to eliminate many of the most common uses for cars.