action active authorities authority blue chopper control copter flight flying helicopter monitor monitoring motion moving observation patrolling police police-patrol power safety security skies sky sky-watch speed technology transport warning watch watching white appearance confined display displayed engines equipment heavy heavy-duty historical history locomotives machinery machines mobility powerful rails railway railway-yard restoration restoration-yard restored steam-engines steam-locomotives steam-trains strength trains transportation boat boats creel eat eating fish fisher fishers fishing fly food gull industrial industry keep keepnet nature net ocean saavem sea seagull seagulls tidal water wave waves wing wings