The RK Cab Forward has the largest swing I've seen (But I don't have the RK Big Boy.). But the Berk isn't the same style as the articulates. I have a RK PRR Steam Turbine (The big one they made 1st, not the tiny later ones.) and a RK NYC Hudson. As far as I remember, they both stay with in the edges of FT. So if the Berk does overhang, it won't be much.
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