As a derivative from the earlier mainline boxcab kit, I had been fiddling with the design of a shovelnose diesel. It’s designed to fit on the Bachmann HO scale FB2 locomotive, as at the time the cost of those locomotives was incredibly inexpensive. However before I could do anything with the shovelnose, the FB2 supply dried up and I got tied up in other projects. Here’s hoping this resolves that oversight.
As a note, there are enough similarities with the Bachmann HO scale FA2 that this should fit, but I can’t confirm that at present as I’ve not tried it myself. You might also be able to fit this to other Bachmann HO scale cab units (like shark noses or F units), but you’ll likely need to make modifications to the frame plate for it to fit.