Howdy gents!
Apologies for the delay... for my "close enough" solution for the RhB, I use The Army Painter Spray Paint: Color Primer Pure Red.
I find that this gets there in the end, though there are some notes.
Primarily, the undercoat / primer is important. (I know, primer ON primer?!)
For certain cars, just a pass (or two) of the color does fine. In rare cases I've had to spray an undercoat of either Testors Grey Primer or The Army Painter Dragon Red first, then the "Pure Red" as the second coat.
For my FO cars, I use the Army Painter Drago Red as the top colour. Same notes as above on undercoat.