How to control the train with dynamic braking?

[cnbalasub]

I had a lot of trouble trying to keep the train within the speed limit when the train goes downhill. Especially with the route of Marias Pass and I don't know if the diesels have the dynamic brakes so I can apply the dynamic braking. Look like to me there isn't any because I have to apply the brake right down to 50% or more then the train drop the speed. I have to release the brakes and bring the train running to the speed limit where it posted but the train keep increasing the speed then I have to apply the brakes like back and forth. It shouldn't be like this and not sure if anyone else have better solution how to keep the train running downhill with speed limit?

Thank you,

John

[BNSFdude]

DBs up til DB4, if DB4 doesnt hold it take a minimum and vary DB effort to control speed.