arch blue bridge centre city contemporary cross dundee footpath glass lighting modern over pedestrian purple rail railway span steel stylish tracks walk walkway grey greyscale monochrome countryside disused estuary exercise forest green landscape line Mawddach natural nature path peaceful river track trail tranquil view wales water welsh amsterdam architecture building composite engineering fixture holland hub material metal passengers platform public transport rails rolling roof station stock The netherlands train transport transportation travel urban voyage attention beware black danger directions forbidden isolated passing pictogram red security sign trains triangle warning yellow access commuters evening floor historic information landmark Melbourne old schedule ticket timetable train station vintage cantilever crossing Edinburgh fence foreground Forth girder girders iron mesh scotland scottish ship tanker blocks buildings cityscape England english Great Britain landmarks London London Eye shard skyscraper thames tower wheel