I am not aware of a Williams N.H. m.u. can you post a picture? I suspect a custom paint job or you are confusing the Williams G.E. E60 or an EP5 electric Locomotive as an m.u. car. The Williams E60 had incorrect EMD E7 unit side frames. The EP5 had the Alco PA. Sideframes which are close enough to the real one.
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