We recently did a Collector's Gallery, Run 304, the February/March 2019 issue of O Gauge Railroading, " A Bevy of Beeps" which chronicled how the Beeps came to be and how Walt Matuch made it happen. Makes for interesting reading and has lots of pictures of Beeps.
GUNRUNNERJOHN is right, command control Beeps are even more fun to operate than conventionally controlled versions. Now that Scott Mann has made Electric Railroad Components available again, I think I will make one or two more. The only thing is, the components cost more than the Beeps did 10 or 12 years ago So what, they are still fun to run and worth a little extra dough for command control capability.