Reply to "Lionel model R transformer--stumped"

Anything is possible, Rob.  Just like the possibility that Lionel did a redesign and made only a few before closing down for the war.  I do recall that sometime in the 40's the red light would stay on even though the breaker hadn't opened.  My father had it repaired and told me that the repairer said a set screw was the issue.  I'm certain that if it were being replaced, he'd have proudly told me he got a new one; I also doubt that he's spend the $$ for another if this could be repaired more cheaply.