Like everything about CF7's, timing is everything. The original batch of CF7's were built as two-stackers and didn't change over to the imitation Farr-stack manifold until about late '72. The "Chicken Basket" spark arrestors were used on both two-stack and four-stack locomotives, but even ATSF didn't think they worked all that well and they were taken off many units.
RBMN bought a bunch of CF7's as a dealer. The ex-GM of another shortline that I work with bought his four CF7's from them. So there were a number of units that show a transition RBMH ownership in the chain where they never even ran there.
As a news update the molding tests are complete on the three-window angled cab, looks good.