This locomotive kit has a long history in O scale. As I remember it was originally issued by Varney. Then a company called General Models bought the models and patterns and it was issued by them for awhile. After that, The All Nation hobby shop bought the line and it became All Nation for years. I am most familiar with that line and they had at that point in 70s the 4-6-0, a 4-4-2, a 4-4-0, and a 2-6-2. They also had F3 and F7 A and B Units along with the NW2 switcher. I think the diesels were added when is was General Models and some of the steamers. There has also been an 4-8-2 and an articulated of some type mentioned as part of this line.
All Nation sold off the Steam loco line to Babbitt who made a lot of upgrades to the mechanisms which included sprung drivers and I think Can motors. Finally Babbitt sold the steam model line to BTS, Bill's Train Shop.
I don't know the dates for these changes. When I got in the hobby it was All Nation and it was a big player in the O Scale hobby at the time. Also, all models were not always available at the same time. It would be interesting to learn when each model was added to the line. They do all follow similar assembly and have a family look. Also, they all used the same size drivers.
