ding ding ding - yes ! Allegheny River trail
we started at Emlenton and went through the Rockland Tunnel - and then continued north (maybe 5 miles - not far from the Kennerdell Tunnel) before we returned (and stopped at the Emlenton Brew Haus for a great burger and beer !)
Very nice ride along the Allegheny. Which includes the Rockland and Kennerdale tunnels. the Kennerdal tunnel is over 3,350 feeI long with a bend in it. If you would have continued north you would have see the Belmar bridge that Indyfabz posted pics of. the Sandy creek trail intersects with the Allegheny river trail and is also a great scenic rail trail. Another good place to get a beer and something to eat is in Franklin at the Ales to trails brewery.