The Erie to Pittsburgh Trail when complete will be approximately 270 miles from Erie to Point State Park in Pittsburgh. It is currently about 63% complete.
An enumeration of the trails along this line with milegles can be found at Trails Along The Spine.
There are a connecting trails that intersect the this Main Line.
There is an Interactive Google map that shows all the trails in the area, along with icons for parking, lodging, restaurants, bike shops and other services.
There is a list of GPS coordinates for trailheads along the main line.