There are no security checks at the commuter trains (where the bombings happened) at Atocha or other stations (I traveled by commuter train from Atocha to Chama

There are no security checks at the commuter trains (where the bombings happened) at Atocha or other stations (I traveled by commuter train from Atocha to Chamatrín a couple of months ago). The security checks are only for long distance trains at larger stations, so a terrorist can either just again bomb commuter trains or use the commuter train or bus to get to a small station and board the AVE there. EDIT: Correction, I took the commuter train from Sol to Chamartín, so I do not actually know if there are security checks at the commuter trains at Atocha. But I assume not since it would not scale and there were no checks at the other stations.