The “Boarding Car” seems to be all over the map as far as numbering and what they were.
A 1905 ORER shows Boarding Cars in
90100-90109
..and about 39 more in scattered numbers ranging from 285 through 18787 with no pattern and no two numbers in sequence.
An earlier source (don’t recall exactly which at the moment) had Boarding Cars as numbered A-M…… noted because it sounds like the same series the Dynamometer “Z” was in.
I have been busy securing a piece of property and drawing up house plans so haven’t had time to begin digesting the Waycar Book.
Ran across an item in Railway Age that states that the CB&Q tested a Wooten Engine that had been on display at the Columbian Exposition and that it unexpectedly burned soft slack run coal very well in several runs Chicago-Aurora. This is after the earlier use of wide firebox 2-8-0s that were converted to conventional boilered locomotives because they were not successful on the CB&Q.
Charlie Vlk