"Is 4 techs few? How many would we expect?"
If you listen to some folks, they'd say Lionel must need dozens to account for the (largely imaginary) huge numbers of returns 
. It's actually reassuring that they need only 4 or so to keep returning failed or dysfunctional new products in a few weeks time most of the year. According to the video they are making about 50,000 Lion Scale products on-site. Figure that is probably only a few percent of their production and we're talking millions of individual products I'd guess. Fun video.
