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Donostia-San Sebastian's cross-border narrow-gauge railway line, AKA the "Topo". Closest thing to a metro around these parts, I suppose.
Pros: fast, reliable, modern trains, only rail line that works with local smart card, 15-minute interval between trains
Cons: tiny, cramped trains (this is technically a suburban train line but holy shit subway-style vertical seating would have been a blessing, especially on the rush hour or after a football match), the local government insists on calling it a metro when it really isn't, one of the stations (Intxaurrondo) is deep as fuck so you either have to ride some neverending escalators or hope you get off the train on time to ride the elevator, which kinda sucks if you're in a wheelchair.
Overall it's pretty decent, wouldn't really change it for anything else.