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Carmanah's self-contained solar obstruction lights are perfect for marking blue flags and other obstructions for aerial and ground navigation. All components, including the solar panels, batteries, and LEDs, are housed in a single compact unit, making installation quick and easy, and providing premium reliability to improve the safety of your railway yards. Designed to withstand the harshest environments, Carmanah's solar lights are trusted worldwide with over 400,000 installations in over 110 countries.Carmanah's blue flag safety light uses the best performing battery on the market - meaning no maintenance or battery replacements for 5+ years. Shockproof, waterproof, and built to last, Carmanah's solar safety light will be the most reliable piece of your safety arsenal for years to come. To learn more, visit our website at https://carmanah.com/obstruction/applications/blue-flag-lighting-railyards