Premier locos and rolling stock won’t look out of place with your Railking unless you get the same model and the Railking is under scale. A GP-7/9 Railking is scale so a Premier GP-7/9 would look fine next to it. A Railking Alco PA1 is compressed scale so a Premier Alco PA1 would look big next to it. You should be good with the Premier S2.
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