I am always having trouble seeing if whistle smoke actually working with smoke stacks so close so I made a fix!
I had some evergreen 1/8" tubing laying around so using my modelers saw and miter tool I made a 90 degree elbow.
I filed just enough off one end so it would fit nicely into existing whistle assembly and just high enough to clear the red valve handle as well.
the results now I not only can see the whistle smoke it goes back towards the engines cab no more integrating with main smoke stacks.
I painted the white styrene with engine black paint blends in rather well. I did not glue in place it merely is a friction fit assembly.
Sorry didn't see a way on iPad to embed the video.