The Brief All trains on Metra lines UP-N and UP-NW were stopped early Friday. The disruption was due to a vehicle striking a bridge near Clybourn. A vehicle struck a bridge in Chicago on Friday morning, halting inbound and outbound Metra trains on two major commuter rail lines. What we know:Metra said service was suspended in both directions on the Union Pacific North (UP-N) and Union Pacific Northwest (UP-NW) lines due to the bridge strike. Riders on both lines were advised to check Metra’s website for updates.