Some of my favorite big articulated steam locomotives are SP's unique and powerful Cab Forwards. We've seen SP Cab Forwards in O-Scale from both Lionel and MTH. Lionel's version depicts the AC12-Class 4-8-8-2 Cab Forwards that were the last versions built (one, #4294 has been preserved and resides in Sacramento, California at the California State RR Museum). MTH has made a couple versions of the Cab Forwards, too.
My idea is for Lionel to make new Vision Line Cab Forwards with new details depicting some of SP's other classes, including the following:
-MM2-Class 2-6-6-2: 12 engines, built in 1911
-AM2-Class 4-6-6-2: rebuilt from MM2s in 1914
-MC1-Class 2-8-8-2: 2 engines; originally standard Mallet engines converted to Cab Forwards; built in 1909
-MC2-Class: rebuilds of MC1s; 15 total; built in 1909; rebuilds in 1923
-AC1-Class: 15 rebuilt MC2s; rebuilds in 1923
-MC4: 12 units; built in 1911
-AC2: 12 rebuilt MC4s; rebuilt in 1930
-MC6: 20 units; built in 1912
-AC3: rebuilt MC6; 20 units; rebuilt in 1912-1913
-AC4-AC12: 4-8-8-2s; Lionel has produced only the AC12s
Some of the early Cab Forwards (MM and MC-Classes) were compounds (with high and low pressure cylinders) that were rebuilt as simple (all cylinders the same size). Feedwater heaters were added to the rebuilds.
Are there any SP fans who would want some of the other Cab Forward designs, other than the AC12s, to be produced as Vision Line models? I think that these interesting engines should be produced.