Yeah ... Those tunnels are going to be hard to match. If you disable any "snap to grid" tunnels, which also disables the dighole, will revert back to normal for anyone who downloads the route, and all those hundereds of "big block head" tunnels are totally worthless anyway.
These EBT tunnels are all one of a kind, rustic, hand chiseled rock work, mouse hole in the granite/shale.
When I lay a tunnel, I end up using 3 assets ... a track running separately through the digholes ... then I add a tunnel spline that is under the static/spline tab, and is not located under the track tab at all ... then I add a static building tunnel portal.
These tunnels are sort of like mine tunnels, with shored up timbering all the length.
Quite intregueing this EBT route is !
BTW: there was a 3rd tunnel that was bored, but was never used, as no track was ever extended down to the proposed PA Southern route
Three of the four EBT tunnel portals are poured concrete - one arched, one square and one hexagonal. The fourth was natural rock. None are chiseled stone. Al three concrete portals were covered by roll-up doors since about 1918 or so.
There was no third EBT tunnel. The one you are thinking of was the South Pennsylvania Ralroad Tuscarora Tunnel. The EBT Shade Gap branch was graded all the way to the South Penn and would joined the SP grade at the west portal of that tunnel. The tunnel had not been bored through when JP Morgan brokered a peace between the PRR and the NYC that halted construction on the SP. Today it is one of the two bores of the Turnpike Tuscarora Tunnel.