These 63' "shorty" streamliners date back to the early days of N scale. The first production runs used some sort of horrendously awful plastic that was seriously prone to warping. It also tends to melt when faced with any kind of paint-stripping agent, so be careful. Later production runs used more traditional styrene. These cars were designed specifically for narrow radius curves and, as such, have no real world equivalent.
Vista Dome -
These same cars were also sold by Parkway Industries (some sort of Bachmann subsidiary). Same exact models, but in Bachmann-style clamshell boxes and marked "Parkway".