(Rough and Tumble Engineers Museum, 48', 38-36-(a) across dry land WNW of Gap, Salisbury Township, Lancaster County, PA. US30 W. 1.8 miles from jct with PA41 in Gap to the bridge on the N. side of the road. (6-2-06, N39° 59.89', W76° 03.26') Photos by Jack Schmidt.