K-Line was the only manufacturer to make 21" Superliners in 3 rail besides Williams, though the Williams aren't worth buying imo (zero detail). Lionel and MTH's cars are 18/19".
Boilermaker is right, there are some available on the auction site. You will pay out the nose for them. I saw a Transition Sleeper alone go for $500, so good luck. The people that also seek Superliners will fight for them.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .