Railworks America

For some reason, whenever I run a train to Riverside, once I get around the wye the locomotive's sound cuts out. Once the sound cuts out, it is sporadic at best, if it comes back at all. I messaged Smokebox about the problem, as it was most prevalent on his FEF-3, yet when I deleted the FEF from the route and used the RS1s and SD7s, I had the same problems with the sound cutting out around the Riverside area. Smokebox suggested my game was running out of memory in that area, yet all the other routes I have work just fine, including running the FEF-3 on the Feather River Route, and Sherman hill which are heavily detailed in many areas. In the Riverside area I tried keeping the amount of cars spotted at industries to a minimum and placed no locomotives in that area to see if it would improve, but the same sounds issues occur regardless.

Does anyone have any ideas and or solutions to what may be occurring?

Thanks,

Logan