I need help on the U876A coal to Cumberland Shaw mine I get 4.1 miles left near the end and the signal stays red what do I have to do
You've posted in the wrong forum. This is the TS2021 forum, not TSW, and Sandpatch doesn't exist in TS2021.
I have completed "U876A - Coal - Cumberland to Shaw mine" from Journey mode recently (thats in Chapter 3 - for AC4400) Had no problems with signalling there. Sometimes you can get permanent red signals if you save and reload during the service (especially long ones) - thats quite common problem on Sand Patch. To avoid that I have played them in one session without saves.
IIRC, once you stop beyond the Shaw turnout and are ready to reverse into it, it is protected by a red signal-- but contacting the dispatcher authorizes moving through it and you won't get a SPAD. (Note: "restricted speed" is 15 mph, which also is the limit for the entire Shaw spur anyway)
Are you referring to the red signal before crossing over to the other track? How long did you wait? There is in fact an auto rack train coming that takes a bit to get there. I actually went to the map screen (9) and back tracked west in order to find it because it was taking so long, I started wondering too.
If driven by AI, westbound U876A crosses over into the eastbound main near Mance at 15:44. It heads west and then backs down the Shaw mine branch, clearing the main at 16:00. If you are running a bit late and have encountered a red signal before crossing the over to the other main, that makes the service that much more interesting! The TSW2 dispatcher is dynamic and will let eastbound traffic onto the main if you aren't there. Once that clears, you should get a green to crossover to the EB main, pass through the tunnel and head to the Shaw mine branch.