My train transformer did not work for etching unless I pressed the
horn button, then etching was slow etching with ospho as the
mordant etching brass.Wonder what Im doing wrong.
check to see if the train transformer is producing Direct current,
which you want for etching, plating, or the like, or whether it's
producing Alternating current. Some sets I've seen have the
transformer only reducing the line voltage, so it sends variable low
voltage AC into the train tracks, not DC. AC would slow down the
etching, not assist it, since for half of each cycle, it would be
sending reverse current into the circuit. The train set I'm thinking
of did it this way so that trains could be placed on the track in
either direction, and still get correct power. The motor itself ran
on DC, but the rectifier circuit was on the train engine, not in the
power transformer. I have no idea whether all train transformers do
it this way, or only that one example I saw. That one may have been
an oddball variety...