You gotta turn down the sound of the water. Drowns (no pun intended) out the loco sounds.
Really, I though they were pretty well balanced as you can hear the brakes, bell and wheels pretty well on the entire train. The engines are almost at idle as they are on a downhill coast and they do not use DB on this line. I could have set up one of my remote mics to bring them in better but I did not have time. I'll give it a shot next time to see if it comes out better.