Not to forget the NASG site, which has a compiled listing of most Lionel released American Flyer products.
Note: Not all pacifics are listed on the locomotive page yet, however, the site still provides a real good overview of what has been released in recent years.
The NASG has recently rebuilt their site which explains why it is currently an ongoing project.
www.nasg.org ...will take you there, first class at that!
Joe