@article{ref1,
title="Evolution of railway signalling for speed and safety",
journal="Indian railways",
year="2005",
author="Vaidyanathan, K.",
volume="51",
number="2",
pages="17-18",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0019-6274",
doi="",
url="http://dx.doi.org/"
}