rural rairoad traffic signals

railroads vertical rail transports traffic speed limits law obey warning caution pole railsign beware symbol guide safety warn hazard transportation signage indicator limitation kmh springtime concrete sleepers track infrastructure carriage travel public urban countryside rural trackbed drainage structure crushed stone washed gravel stabilize soil ground rusty low angle blue sky scenic scene steel serenity iron nature old rusy spain badajoz signals landscape lines perspective torremejia tierra barros extremadura rairoad railway network concept