Below is a Dean Heacock pic of two real double
doors.
To get these cars completely accurate would
require removing
the walkways and filling the holes. I didn't want to do
that with
mine. Also you will need to make the two doors different
sizes like
the pics above. I left mine as is.
Mine came undecorated and I painted and decaled
them
myself. I am uncertain as to which schemes, if any,
Athearn puts
out for Chessie, B&O, C&O, or WM.