Black rails

Well, I’m no rail designer, but another theory i have come up with is this…

We all know about rail can bend and get distorted in the sun, so, if it is a hard layer of plactic or tar, it may contain a easily broken wire. I know that if a rail breaks, it sets off the ABS or other system, but if this layer bends (the rail bends), the metal strip inside will break, setting off a warning that the rail has bent or heated up.

Actually, I would like if a RR worker could tell us what it is, I wanna know!

Brak, the post above yours is from probably the most eminent authority available on the subject!

Aha proves there is a answer for almost anything. Thanks [:p]

What???

After reading some of these post, I think some of us have been in the sun too long!?!?!
Maybe some sunglasses would help… [8D]
[:D] [:D] [:D] [:D] [:D]

Talk about your maintenance headaches…