A Google search for WM steam will turn up multiple authentic examples with the fireball.
Rusty
Yes, and I stand corrected concerning the big, modern WM freight steam locomotives. A good friend, who was raised in the B&O and WM area during the steam era, has confirmed that their freight locomotives did indeed carry the fireball logo (however the passenger power didn't). Part of what threw me off was the famous WM 150 ton Shay, the "Big 6" (now at Cass Scenic RR), which did NOT carry the fireball in regular service, but when the WM donated it to the B&O Museum, it was repainted with the fireball logo.
As much as I really like that fireball logo (I still have a Sunset/3rd Rail WM 150 ton shay WITH the fireball logo), I personally don't think that the 1309 should be painted up with the fireball logo, since the WM never had any of those compound 2-6-6-2 locomotives. I would personally prefer the more subdued WM scheme with the two yellow stripes, above and below the name "Western Maryland" on the sides of the tender.
Since they already have the magnetic "Chesapeake & Ohio" lettering for the tender sides, for future use on photo charters, the WM subdued lettering would be appropriate, in my opinion.