Southern Pacific Switching Layout

[FCIN]

I would like to do some switching, however most of my rolling stock still have Horn-Hook couplers!

Well don't let that stop you! You can still uncouple those X2F couplers with a small screw driver or whatever. Manually uncoupling your cars adds to the prototype operational aspect of things. If necessary, grab an old car (or even a caboose) and put a Kadee style coupler on one end and an X2F on the other so you can use that NW-2 to switch with. At least it will give you a feel for how you like or dislike this plan.