Yeah, I actually have no idea where the entrance to it is in each terminal. But I typically find the security staff lingering around the be helpful enough, I have gotten lost trying to walk T2 to T3 for the LeMeridien. I've got something like a 4-5 hour stop in July, will try to investigate.

I noticed the site mentions there's an airside version of it as well, which would shock me if true knowing how security obsessed that airport is. I've definitely seen the train in operation on a couple of visits though, so know it does exist somewhere.