The old Con-Cor trucks rolled quite well, especially if you can get the earliest with metal small-flange wheels. Paint or blacken the wheels and they're as good as most of the trucks sold today.
As for Andrews trucks, You may be right about their being banned, although I've found dates ranging from 1954 to 1959 on various sites. One site even mentioned that the "similar Crown trucks" were never banned, but then had a response that the reader can't find anything about "Crown" trucks. Several of the sites also said that the ban was "not well enforced", so cars with Andrews trucks still snuck into interchange service. Since the AAR Interchange Rules still had repair instructions for similar trucks, something was not completely banned. The Interchange rules do say that trucks are subject to the same age limits as freight cars, so by the 60s many, if not most, Andrews trucks would have been reaching their 40-year limit.
The only thing I can find on "Crown" trucks in a quick Google search is this, from the Trains forum:
" Posted by Anonymous on Sunday, March 07, 2004 6:18 AM
The Andrews truck was designed to replace the archbar truck by allowing use of the old journal boxes, etc. in a new cast frame. The journal boxes were attached to the Andrews frame in the same manner as they were attached to the archbar - with vertical bolts on each side of the journal box. This necessitated the frame member underneath the journal box. I suspect the Crown truck was the designation of the 70-ton Andrews truck used under the Pennsy H21 and H25 cars. N&W had 70-ton Andrews trucks under class HU (later H3) hoppers with "Andrews Floyd" cast into the side frames above the bolster opening. Were Crown and Floyd the designers of their respective trucks?"
Another poster then commented that we've gone full circle, from separate bolt-on journal boxes, to integral cast boxes, to separate roller bearings, held in place by the weight of the car.
And, even archbar trucks were never banned for home-road use, so if your car isn't interchanged, you can use whatever you like. That may be how the ex-GN 2-bay hoppers kept their Andrews into the BN era. Thew were scrapped (worn out) before most received new trucks.
