<a href="https://en.wikipedia.org/wiki/Metro-North_Railroad" class="extiw" title="w:Metro-North Railroad">Metro-North</a> <a href="https://en.wikipedia.org/wiki/Cab_signalling" class="extiw" title="w:Cab signalling">cab signaling</a> system
<p>Abbreviations in photo:<br>
N - Normal track speed (Clear)<br>
L - Limited Speed<br>
M - Medium Speed<br>
R - Restricted Speed<br>
INOP - Cab signals inoperative (cut-out due to failure, or train is traveling in non-cab signal territory)<br>
TEST - Test mode selected and underway<br>
VZ - Velocity Zero (train is moving, but so slowly the speedometer registers 0)<br>
BA - Brake Application was made<br></p>
Note: The actual "normal track speed" varies by location as indicated by company (employee) time table and any applicable train order(s).
<a href="//commons.wikimedia.org/wiki/User:Darienredsox" title="User:Darienredsox">Darienredsox</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>