process should you not receive your merchandise. Payment with
PayPal is far safer for international payments than direct payment
with a credit card.
The only drawback with ordering from China is the “free” ship-
ping. Orders from China are sent via China Post – which gives
new meaning to the term “snail mail”; so don’t expect to receive
your order in less than three weeks, and five to six weeks is pos-
sible. But I haven’t lost an order in the post yet.
Optical train detection offers several advantages over electrical
detection of trains – particularly so for command control sys-
tems, AC operators and high current systems.
A reflective optical detector can be constructed out of modules
designed for the robotics/micro-controller hobbyist with just a
few interconnections between them. The resulting detector can
operate from between two ties and reliably detect trains passing
above. Using this detector can help simplify the design and con-
struction of a signaling or automation system for your railroad.
Give it a try; for $10 what do you have to lose?
“Optical train detection offers
several advantages over electrical
detection of trains – particularly
so for command control systems.”
Optical Train Detection - 9
MRH-May 2014
