UPDATE: The MTH hoppers I'm about to describe turned out to be inaccurate models. Read on for discussion of accurate 3-Rail models.
I have been looking for a period-correct set of O-Gauge Norfolk & Western hoppers for some time now to run behind a Class A or Y6B. Preferably in a set of 6 for easy building of a long unit coal train. I have narrowed my options down to these two MTH sets, and was wondering if any steam / N&W experts here can confirm if I've made a sound choice. My reason for choosing them is these are the only hopper sets MTH has produced without the N&W circle logo, which research tells me is a 60s/70s scheme.