On Wed, 17 Sep 2003 22:00:23 +0100, "John Stumbles"
] wrote:

Anyone remember the old Hornby Dublo train set controller box which had some
special bulb in series with the transformer output, so that if you
overloaded or shorted it the bulb would light up but in normal operation the
bulb would quietly (or invisibly) pass current to the load?

You might need to post this in alt.geriatric.trainlovers

PoP