(Sherwood, OR)  --  Firefighters continue to monitor a wooden train trestle in Sherwood, which caught fire around 4:20 yesterday afternoon.  The trestle is located near Southwest Tualatin-Sherwood Road and Langer Farms Parkway, and authorities say it's owned by Portland & Western Railroad.  Officials say it appears the fire started on the 600-foot-long trestle and spread to the brush below.  There have been no reports of injuries.