Was there ever a Rollins Pass summer release?
TrainzItalia released Rollins Pass 1915 many years ago as a Payware package, it was build 2.4. So far as I know it is no longer available.
Rollins Pass 1915,<kuid:57230:19000438>
Rollins Pass Winter,<kuid:57230:800026>
Author was Jango
There is <kuid:682163:101168> D&RGW ROLLINS PASS WITH MOFFAT TUNNEL 2.3 by pennsylvaniarr01 on the DLS but it is a fantasy route that does go over the pass. It is build 3.6, needs some work to get up and running in TS12.
It appears to be based on DEM and might be a candidate for updating and modification to get playable for the era of your choice. BTW he did a session for the route too.
Edit:
Wow, thanks for asking this question BraselC5048. It caused me to take another look at pennsylvaniarr01's route, here is what I found.
I'm working on this in TANE but you should be able to get this cleaned up in TS12 easily enough.
You absolutely need the session <kuid:682163:101170> D&RGW ROLLINS PASS WITH MOFFAT TUNNEL 2.3 because it looks like the author got a little confused as to which layer he was working on and some of the track is on the route layer and some is on the session layer.
The session is missing a lot of assets but, as far as I can tell, they are all rolling stock and shouldn't be a problem.
First thing to do is edit the session and merge the session layer into the route layer and save it as a new route and session.
There are about three places where the track is disconnected but they reconnect easily. Edit the new route and fix the track then move all the rolling stock to the session layer. Overwrite the route and save the session as a new session.
Presto! You are ready to start reworking the route to your taste. Although it is kinda fun messing with pennsylvaniarr01's session first (once you've gotten it separated out).