Ordered 10 2596 switching regulators from eBay. The cost was
$12 including shipping. It only took a week to come from China.
The board is about 1x2 " and no heat sink.All that is needed is
a bridge rectifier and filter cap. The output is adjustable to 5V
and will run off of track voltage.This is a very cheap and easy way
to operate Miller signs or any 5v device from track power.