I got the postwar double header video up on youtube last night.
I modified my camera car so I could have a coupler on both ends.
The camera car is between the 2025 and the 675, and I switch between forward and back to get the smoke from both locos.
I noticed an increase in the smoke volume after several trips around the track.
The only malfunction I had was shorting tender wiring, which I removed to correct the problem.
Most of the video only shows one of the locos, but it was too much fun filming the smoke and varying the puff-volume.
Welcome Terry to the double-header club. I will watch your video now.
Here is a link to my video.
https://www.youtube.com/watch?v=qmgAOIgfriA