brick bridge cantilever clouds coast cross Edinburgh estuary famous Forth grey iron landmark metal paint painting Queensferry rail railway red river rocks scotland sea shore sky span stone train water tower road suspension Australia background ballast blue bolt brown bush clips country crossing day Dirt grass green horizontal landscape line nature outdoor photo photography pine railroad rural safety scenery season sign sleepers straight timber track transport travel tree winter asphalt car cars. ligths freeway highway traffic trip tunnel vehicle way London pedestrian supports thames walkway cutout isolated lights railroads semaphore traffic light trains warning