PLEASE PLEASE PLEASE paint the diaphragms silver on the El Capitan cars.
Look at the pictures Erik Lindgren posted in his Super Chief thread.
https://ogrforum.com/t...-1951-53-super-chief
Pecos River Brass also used a silver colored material for their Super Chief diaphragms. Perhaps Scott (and you ought to email him) can work something out with the production facility to come up with some silver diaphragms.