So I’m modeling the IRHS/IARM layout plans and I’m having trouble whether using full Brass or Steel tracks (I’m used to steel but I’m willing to give brass a try Im not sure on what’s the difference in terms of power and performance) and weathering the locomotives and rolling stock to give it a vintage look and feel (I’m wondering on how to weather the locomotives without damaging their electronics and internal components), then there’s adding Tsunami2 sound to a Bachmann EMD DDA40X (UP 6900) and an EMD SD45T-2 (SP 4900) I’m working on a Kitbash as well but questions may arise as I work on it (The kitbash is a ALCo C-420 to an MLW M-420)
Gidday, I’m uncertain as to the layout plans you are referring to, but making the assumption that you are modelling in HO scale, the only track I would use is nickel silver. Far too many issues with keeping brass or steel track clean enough for reliable electrical conductivity.
My two cents worth,
Cheers, the Bear. 
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I’m modeling with O scale but I could go HO in this case