What are these colored lights?

[Ladder44 73]

I've noticed colored lights on on trains on the hudson line and i was wondring what they are, they look like those new pump level lights on the sides of engiens.

[DOC22 1]

I've noticed colored lights on on trains on the hudson line and i was wondring what they are, they look like those new pump level lights on the sides of engiens.

If you're referring to lights on the sides of the rail cars, go to the link below:

http://emtbravo.net/index.php?s=&showt...ost&p=70962