BARCELONA, Spain (AP) — A Barcelona commuter train crashed Tuesday after a retaining wall fell onto the tracks, Spanish regional authorities said, killing at least one person and injuring 37 others.

I love a good road trip, but sometimes, you want to sit back and relax while someone else takes the wheel. This is especially true in Europe; its narrow roads and tiny cars can kill the vacation vibe.

Most of the passengers emerging from the station in Bellvitge, a working-class neighborhood outside Barcelona, have no idea just how innovative the city’s subway system is. Using technology not unlike ...