its not that good having been through every train tunnel in sydney id know
again this tunnel is so easy its not funny you can run in at anytime as long as no one is looking at you.
Yes its dangerous trust me lightrail tunnels are just the childrens playground places like in between central and redfern have awesome features like a turnback and a portal with an awesome ladder that you used to be able to enter from track side of central
thus if you've never been in a train tunnel whilst there running or arent going with anyone who knows there s*** dont bother you'll end up squashed under or on the front of a train
thats my 2 cents worth of input
stay safe
"No Urbex... No fun"
Syd Based