Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

That's a nice red and as you say:

• You have it in stock
• It matches your other engines

That's a winning combo for sure 

Edit:
Here is color compare between what I believe is Original Empire paint on the B-43 Pumper/Reverser, then Krylon Cherry Red and Banner Red on the B-43 Strapped Boiler.