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ZTR adds features to remote control locomotive system
Appears to be a dead link or perhaps a defunct site. Tried to access it via Google search and ended up with a 404 each time.
It (currently) works for me although it’s a redirect to http://www.ztr.com/rover-portable-locomotive-remote-control.php. I’m guessing ZTR saw a lot of links to a page they’d renamed and put in a rename or something.