line up of collectible railroad switch lanterns with white, red, and blue glass

antique appraisal old fashioned retro vintage obsolete decor decorative elements history historical museum piece defunct kerosene flammable messaging code meaning stop warning meaning colored colors cobalt cherry signal devices technology approach caution lenses roundels hue hued untinted semaphore apparatus visual signaling railway railroad paraphernalia gear equipment amber flashed Baird yellow rare items collectors switchman railway railroadiana swinging safety signal practice globes barrel shaped pear fresnel lens corning set collection design style weighted specialized specialization