León isn’t exactly what I would call a major city; it has a regional significance for sure, but just between 100-200k inhabitants, and Madrid isn’t even that close. Four trains per day is less than ideal, though, you’re right there. In my opinion, the situation is much worse in more peripheral areas of the country. For example, trains between highly important regional hubs like from Sevilla to Valencia or even Málaga take huge detours and operate surprisingly infrequently.
León isn’t exactly what I would call a major city; it has a regional significance for sure, but just between 100-200k inhabitants, and Madrid isn’t even that close. Four trains per day is less than ideal, though, you’re right there. In my opinion, the situation is much worse in more peripheral areas of the country. For example, trains between highly important regional hubs like from Sevilla to Valencia or even Málaga take huge detours and operate surprisingly infrequently.