What does W/L mean in Railroads?

This page is about the meanings of the acronym/abbreviation/shorthand W/L in the Regional field in general and in the Railroads terminology in particular.

Whistle Level Crossing ahead

Sign boards bearing W/L on railroads are meant for the loco drivers to blow whistle

Regional » Railroads

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"W/L." Abbreviations.com. STANDS4 LLC, 2015. Web. 3 Sep. 2015. <http://www.abbreviations.com/term/572167>.