well im sure paul stainz holt has you bested-
i have a modest gaggle
4 green #1, 2 (and another #2) , and 3
one K-3, black
1 brown, #2
and i consider the 2015s the super version
2 green-us and euro, one black, one maroon, one yellow
you know when it comes to the stainz, i think there is no better all purpose loco, pulls, reliable, robust, one handed re-railing-and not too dear at all-probably the single loco that can make a g scale start-up a great experience-simply delightful-hook up some lighted coaches and thats a train-and somewhat story-book like in appearance, yet absolutely authentic
i covet a dark brown cab with a red rear light-so long as its not a grinder-2040 #4 cab i think