I've been following your thread on the ACL vents. If I interpreted your latest response correctly is sounds as though you have access to a 1940 ACL car diagram book - is that correct? The reason I ask is that to my knowledge the earliest ACL car diagram book to surface dates to 1946-47. If a diagram book predating 1946 exists, would you entertain the possibility of the ACL&SALRR HS obtaining a copy for our files? Thanks!