Obsolete W-10 (advance railway crossing sign) in British Columbia. Used from about the 1960s to metrication or thereabouts. This sign was placed before railway crossings to warn drivers/
Government of British Columbia
<a rel="nofollow" class="external free" href="https://www.bclaws.gov.bc.ca/civix/document/id/oic/arc_oic/3023_1966">https://www.bclaws.gov.bc.ca/civix/document/id/oic/arc_oic/3023_1966</a>