About the tunnel, I used tunnel 1 voie in mine. Yours is too skinny and tall, the actual tunnel opening. Also, why is there a big difference in elevation from the Perkasie end to the north end? The tunnel has an uphill grade heading north on my route. I found a track chart of the line from 1976 (Conrail) and one by SEPTA more recently showing track removed from Hilltop north in Lehigh County. On both charts it does show an uphill grade heading north through the tunnel. The problem with the old hog dem that fishipsatwork (Paul) made on the dls is that it’s 1/3 arc data and you sort of have to guess track elevations and stuff. It doesn’t have the grade pre smoothed for you. I’m just going to try to make the grades the best that I know. I know the Beth Branch is hilly from what I’ve seen. That was one of the straws why Conrail abandoned it as a through route in October 1984 for freight trains. The line via Reading has easier grades which has been NS since 1999. Conrail started calling it the Bethlehem Running Track between Lansdale and Quakertown after the abandonment of the line through Coopersburg, Center Valley in Oct 1984. That section was Conrail owned then sold to SEPTA in 1993. The line up to Quakertown was bought by SEPTA at some point, maybe 1983 after regional rail service switched from Conrail operation to full SEPTA operation. Of course, diesel commuter service north of Lansdale was gone at that point, it was terminated July 26, 1981. Also, parts of the second track are abandoned, overgrown, and severed in places.