Either:

(1)  there is a short thru the insulation between the ties and the rail in
one track section, or (2)  there is a short in the track clip you are
using, or  (3) there is a problem in your rolling stock; possibly some
piece of your rolling stock is riding differently on the k-line than on
your other track and shorting out  (both side frames of a truck may be
touching the rail for instance), or else (4) the problem is in your
transformer..

This can be a very tough short to find.  i had one like it on my holiday
layout.  I narrowed it down to a few possible track sections and replaced
them all, but on the workbench it took 2 weeks to locate the short!

Let's Sherlock Holmes it,  i.e. use deductive logic.  There are two ways to
test the track:  test each piece individually with a continuity tester.
The piece that shows continuity between the rails is the culprit.

If that doesn't work, set up a loop of the K-line with no rolling stock on
it.  start with a few pieces.  Apply track power.  If there is no short,
keep adding track one section at a time until you get a short,or the circle
is complete.

If you get a short only when the circle is complete, turn off the track
power and quickly run your bare hand over the entire loop, including the
track clip and wires to it.  The place where the short is occurring should
be warm or hot.  Short circuits often occur at the track clip or the wires
that lead to it.  This is how I finally located the short in my track.

If you get a short only when the circle is complete, and opening a gap
between any two sections in the circle eliminates the short, then your
transformer is probably no good.  Try another one.

If you are able to complete the circle with no short, yet when you add a
loco and cars a short occurs, add the rolling stock one piece at a time and
eyeball it carefully.  Try several different locos.   Perhaps one piece can
be identified as the culprit.  Also try a different transformer and see if
there is still a short.

If none of the above tests solve the problem, we both should stop messing
with s gauge trains and take up shuffleboard.

Tom Jarcho






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