As I am planning my layout, I found myself going in all directions as far as motive power. I really wanted to condense it for budgetary and sanity reasons. It's too easy to want everything. I have narrowed it down to four and here is why.
Union Pacific - I love the Challengers and Big Boys as well as the experimental locos they did such as the Turbines. I also like some of the modern heritage paint schemes. And lastly, since the merger with SP, UP is the biggest local presence. This also allows me D&RGW mixed in.
Southern Pacific - They are the hometown boys. My grandfather also retired from them as a yard worker of 40+ years. I also love the Black Widow paint scheme.
Pennsylvania - They just had some of the most interesting steam power out there and in my opinion the best looking stream liners. I think the paint color along with the stripes is what really set them off. I don't intend to have a lot of PRR, but I definitely want a T1, S1, and a few others down the road.
New York Central - A legendary line, and I can't help but love the lightning stripe paint scheme. I don't have interest in there steam power, but will see some car bodies and a few other assorted diesels.
So those will be my main four. Others up for consideration where as follows:
Norfolk Southern - Mainly I like them for the Southern part, a fantastic line with a rich history. I also like the horse head logo.
BNSF - They are the other local guys, but I really don't care for the standard read and silver from SF. I much prefer the freight Blue and Silver. I do like some of the modern paint schemes though.
CSX - Mainly because I like the look of CSX modern diesels. Not enough to justify it for me though.
I do enjoy many of the fantasy paint schemes that the RR's I picked will bring me. I am not a total stickler to perfect accuracy, after all, they're still toy trains and I have my boys involved with me.