These six-wheel friction bearing trucks were used by the PRR under a variety of head-end equipment (B70, BM70K, BM70KA, PB70).
N scale versions were originally available on AHM/Lima heavyweight passenger cars. Later on, Model Power sold their own Chinese-made copies of said cars. As pictured below, the detailing between the two versions is not identical -
Lima wheel Diameter 0.203" (scale 33")
Lima wheelbase between outer axles 0.730" (scale 9' 9")