@breezinup Great post, and I appreciate all the details and the thorough explanations. You expanded on prior posts quite well, and between with all the replies I’m much better prepared to shop than before.
Regarding adding another B unit, I totally agree with you that running a full ABBA set is not very practical. It’s more that I am a “completist” in nature and NOT having it would bug me! 
The full set will probably ever be run once just to say I did it, and then put on display. Or run as two AB sets at some point etc. But they get harder to find as each year passes so I figured better to be on the lookout now.
I will share quite the coincidence regarding the 6-24562 F3B unit. I’ve been looking for one online for quite a few weeks now. I tried all of the OGR advertisers, the auction sites, And even the OGR FS forum etc. I concluded that my best hope would be a “want to buy” forum post in the appropriate section. Right after I posted the passenger car question above, I went over to the forum and was about to post my WTB, and then on a lark decided to search the FS posts one more time. Holy cow! An OGR forum member had posted just the day before the B unit for sale in LN condition and at a very fair price. I immediately emailed him, and I’m happy to share that the B unit is in the mail today on its way! Woo hoo!
