Mal,
No, it is not a heat seal.

It was reported today that DPTI have abandoned the idea of plastic inserts in the rail groove, since the inserts have not been tested under Australian weather conditions.

Alex C

---InTramsDownUnder@..., <mal.rowe@...> wrote :

On 22/05/2017 10:47 PM, jg62430@... mailto:jg62430@... [TramsDownUnder] wrote:

Witnessed today during the Jetty Road track relay. What is going on? It took me a minute or two for me to work out what was going on.

http://tdu.to/2017-05-22_Jetty_Rd_Puzzle__AJC.JPG http://tdu.to/2017-05-22_Jetty_Rd_Puzzle__AJC.JPG

Is it some sort of heat seal for the plastic film?

Mal Rowe