On my regular journeys between BHM & EUS, I've noticed weird looking sensor things at the side of the track at some points (mostly approaching MKC and WFJ from both directions, may be others further up north or other places I have missed).
They look like some sort of motion or position sensor, placed about every 2 meters or so.
Here are some photos which might show what I'm talking about a bit better - http://imgur.com/a/OG3oh (My camera doesn't like focusing at 125mph, apparently)
What are these thingies? What do they do? Why are they only on some bits of the track?
Hopefully one of you wonderfully knowledgeable people will know =)
They look like some sort of motion or position sensor, placed about every 2 meters or so.
Here are some photos which might show what I'm talking about a bit better - http://imgur.com/a/OG3oh (My camera doesn't like focusing at 125mph, apparently)
What are these thingies? What do they do? Why are they only on some bits of the track?
Hopefully one of you wonderfully knowledgeable people will know =)