In researching BEEPs, I saw this ad on Worthpoint.
"RMT Halloween Beep Diesel Locomotive New In Box. The locomotive is 3 rail O scale. Unit #1031, Stock #92472 HALLOWEEN Railroad painting and lettering in a unique 'spooky' paint scheme.RMT-92472 HALLOWEEN #1031 features upgraded speed control and electrical pickup. "
I note that in pictures, both the orange and yellow models of the Halloween BEEPs have painted rails.
So, it looks like the Halloween BEEPs are the upgraded models.
Thx,
Mannyrock