Over and Under

I took a walk along the Blackwater Valley Path today, feeling sure I would find a subject for BlackTulip's Mono Mondat Challenge of Over/Under.  The River Blackwater was mainly disappearing under lush vegetation, which also hid the numerous bridges crossing it! I eventually found this slightly clearer spot with a railway bridge crossing over the river flowing under  a pipe.  I even just caught a train starting to cross over the bridge!