@article{ref1,
title="Safety system for train operations control",
journal="Japanese railway engineering",
year="1977",
author="Iwasa, K.",
volume="17",
number="1",
pages="4-6",
abstract="The high density of traffic and high speeds on Japanese National Railways make important reliable signaling and safety devices. Described are the evolution of automatic train stop, cab signals, automatic speed supervision and other controls.<p />",
language="",
issn="0448-8938",
doi="",
url="http://dx.doi.org/"
}