Unfortuantely, for some reason, the SD60M and Gas turbine weren't included when I installed Sherman Hill, even though they're supposed to be. I've no idea why this is the case. I'm hoping DTG support can help me

I could, but I don't really like the idea of using the older style Gas Turbine tenders by DTM on the train since it would look weird and not accurate.
However there is a way for you to get the UP Gas turbine pack. Either buy the Sherman Hill route or the "Battle for Sherman Hill" pack. I was able to acquire the Gas Turbine when I purchased the "Battle for Sherman Hill" pack which came with the Sherman hill route. Either one should give you the Gas Turbine since it comes with the Sherman hill route itself.

There's admittedly a problem: for some reason, the UP Gas turbine pack isn't available. Is there a chance you can replace what's needed in the scenario with something from this pack? https://store.steampowered.com/app/1364038/Train_Simulator_Union_Pacific_Gas_TurbineElectric_Loco_AddOn/

No problem tonix. I'm glad you you enjoyed it.

lil bit long. but spectacular addons & raiffaan feelings.
thank you

Update joshzilla was the screenshot that was the problem. Thanks for your help as I'm still feeling my way with building. Cheers Charlie NZ

No problem, happy to help.

Thanks 🙏🏿 so much I will investigate as mine is a newish PC

Thank you Crlynch. I'm glad you enjoyed it.
I did run into issues when publishing this with the image file and I believe the issue is due to the size of the file image. My new computer has a display resolution of 2560 x 1440 and I took the screenshots with that size. I thought if I cropped the size of the image it would publish and it did. I think I cropped the size down to 1600 x 1260 or something lower than this. I don't know for sure if the size of the image is the real reason for the publish issue, but if your computer has a high resolution, try to either crop the image you want to use as your cover or lower the resolution. Hopefully this will help you, and thank you again for your comment.

Thanks for that beauty, all ran very well. Enjoyed. Did you have any issues publishing as I've done a couple for this great line and they won't publish.