stockholm passenger train derail eastern sweden collide armor vehicle major military exercise area leave least four people injure authorities say tuesday armor vehicle collide train near small town trosa one hour south capital three people military vehicle injure collision one person train also hurt police say driver train sustain minor injuries spokesman railway operator sj say train three cars carry 70 passengers add swedish arm force nato ally neutral country currently conduct big war game two decades activities take place area accident take place swedish train derail hit armor vehicle four injure