bridge cantilever cross crossing Edinburgh engineering estuary Forth girder girders iron metal rail railway river scotland scottish ship tanker train trains water architecture barrier defence defensive England english flood gray Great Britain grey hood landmark London protection steel thames tidal tide air photography airplane aviation beauty of nature clouds distance engine flight flying height high lake landscape motor sea shadow shadows sunlight turbine antique black flywheel icon industry locomotive obsolete old old-fashioned pictogram railroad sign steam symbol track traffic transport 4wd 4x4 all atv auto car cytout drive foul four-wheel huge isolated machine off-road offroad terrain transportation travel vehicle wheel black cutout driver front grill lamp lamps modern move roof speed suv wheels