So far the problem I found with this route, is the route, train sounds is not matching up to the realistic route. The train horn is too low, and sometimes when you hold the spacebar, the horn just keeps on going until you press the low horn sound.
Track noise is another problem when you go through a point or junction. Only the cars that have the cab will make the clickety clack noise but the rest of the train won't
There are routes whose repair take a MUCH higher priority than SEHS, which ain't the greatest route but isn't bad. And don't hold your breath for any sound upgrades to anything, unless it is so horrible and so often complained about (M7) that DTG can't ignore it.
The whole route is a mess that shouldn't have been released. Terrible scenery (much of it imported from Train Simulator with no improvements) and terrible sounds completely ruined this route.
I still play it and enjoy it, despite the appalling scenery in places. It’s a route I use in real life so it’s shortcomings are pretty obvious.