Nonsense, 461 is a preserved loco, which would make it more commercially viable, it's a sought after loco as well, with many threads on this forum going towards having a model of 461. Obviously the most commercially viable would be a J15, but then your left with the hundreds of different variants, superheated, belpaire firebox, cupboard doors, inchicorised, etc. Even if one is to choose just 184 and 186, it's basically two different models...