The jerrycans were approximately 1/4" wide, based upon the picture I am referencing, which was black and white, with a rule held by a C-stand. The same jerrycans were also used in a single row on the bridge/head section. Definitely NOT tracks. If I can find a good version of the image I will post here.
I believe this is the same detail as on the B-wing. Here is another example of the detail which is also on the back of the wing. This detail is all over the ship. I got this pic from Neisen's build up.