Dear Bach-man,
could you please shed some light onto what these actualy are. Considering part number, most probably a set of ball bearing wheelsets. Product search is no help.
Dear Tim,
They are display rollers for your locomotives. The ball bearing EZ Riders actually move, but, less obviously, the non- ball bearing rollers, which are less expensive, support the lead, trailing, and tender trucks.
Have fun!
the Bach-man
FYI Item No. 92424, 4 per pack, are the rollers without ball-bearing.
There are pictures of Items 92424 and 92423 on page 144 of the 2007 print catalog.
http://www.mylargescale.com/forum/topic.asp?TOPIC_ID=45079 (http://www.mylargescale.com/forum/topic.asp?TOPIC_ID=45079) Thread has a picture of the test/display roller set sold by Aristo Craft. Bachmann's set appears to be similar.