The tunnel is impressive. Definitely it worth to take a look. It could be still functional if needed.
You can reach the tunnel entrance either from the upper in-forest parking (limited capacity, ~8-10 cars), or from the same-level parking at Paw Paw Tunnel Trailhead (at Paw Paw Tunnel Campground).
Take a flashlight.

Beautiful walking, hiking and biking trails.
GPS took me to the wrong entrance. The correct entrance is right on the main highway just past Paw Paw and inside Maryland coming from the East.

Really cool place to visit. Better sinage will help get you there as GPS brings you to the top of the trail head and about 2 miles walking distance down hill instead of the lower parking area that is a short walk to the tunnel entrance.

This was really interesting. Tons of history, a hand dug tunnel. Would have been an enormous job. Beautiful scenery, an easy hike too.

Nice change of pace hike. Parked at the PawPaw Tunnel Campgrounds and walked the trail to the tunnel. I hadnt realized how long the tunnel would be and at 3116 feet long it was pretty impressive. Walkway inside tunnel is very uneven and had puddles so make sure you have a flashlight of some sort and sturdy shoes on. Boardwalk on the other side was nice. Path past the boardwalk was muddy in spots but easy to go around the worst. Made it to the Sorrel Ridge Campsite before heading back. So some deer and lots of fall colors. Overall it was a nice quiet walk with only a few people, would definitely do it again