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The W 40 is the premier elastic rail fastening system for heavy haul, designed to withstand extremely heavy carloads and maintain maximum stability through narrow bends and tight curves. The W 40 has been in service in North America since 2013 and is installed on roughly 200 track miles. The W 40 system is also easy to install, all fastening components can be pre-assembled in the tie factory. And, like all Vossloh rail fastening systems, W 40 is virtually maintenance free.