Canadian Pacific 4-10-2

The Canadian Pacific 4-10-2 "Connaught" was a proposed design, whereby the non-streamlined 2-10-4 Selkirks were to be rebuilt into 4-10-2 Cab Forward locomotives for use in the mountains.
The Canadian Pacific Railroad is well known for running through the mountains in the Western portion of the system, and like the Southern Pacific, it too suffered with the smoke problems inside the tunnels. However, unlike the SP, nothing was ever done about it. A Chief Mechanical Engineer on the Canadian Pacific had proposed rebuilding the T1a class 2-10-4 Selkirks into 4-10-2 Cab Forward locomotives. The T1a were specifically chosen as he didn't want to ruin the aesthetics of the streamlined T1b/c's. CP T-1a #5911 was to have been selected to be the pilot engine for the first rebuild as the 5911 had been involved in a wreck, and it's cab had been completely destroyed in the wreck. It's cab looked different to the rest of the T1a's after the wreck.
In concept, the proposed CPR Cab Forwards aesthetically looked very much like the AC-4/5 Cab Forwards, and much of what had been learned from the SP's Cab Forwards was applied here, such as having all the engineer's controls mirrored over to what would've been the fireman's side of the engine (if it was still travelling boiler first) so that the engineer could still face forward and still be sitting on the right hand side of the cab.
Ultimately, the proposal fell on deaf ears at CPR's Angus Shops, as this had come late enough in the steam era that managment was more interested in investing in diesel locomotives. However, this concept was detailed in a back issue of Trains magazine from the 1980s, where the CME went into detail about how he would've gone about the rebuild.