what is the most popular type of locomotive on your layout

[tetters]

Still relatively new to the hobby, I only have five locos. All diesels; one Gp 7, three Gp 9's (two of which are back in storage) and lastly my SW900/1200. I really like the switcher unit. It is kind of like the underdog on my layout and as such since I usually root for the little guy, its become my new favorite.