Here are photos I shot in the Big Boy’s cab at the St Louis Transportation Museum in Sept., 2002, while awaiting my trip on the Frisco 1522 Farewell Excursion. I scanned these, and you will find duplicates. That is because when I modified the pictures, some elements were enhanced, some were lost. Hopefully the element you seek will be obvious in one or another exposure. Enjoy!
This is partial text from the full article (usually with photos) at https://railroadmodeling.net/news/big-boy-cab-walk-through