The song is about a guy who walks right into one of ac/dc's rehearsals in Toronto just before their appearance at the Sars-Fest concert, also headlined by the Rolling Stones. If you consider the lyrics in that light you'll find the references are about a younger musician being encouraged to break through in the music biz. I was in between songs with my band at Pro-Rehearsal Studios near Cherry St. When I heard an ac/Dc song coming from another room. Well it sounded a bit too good to be anyone but ac/Dc so I cracked the door. Omfg! So I walked down to the back of the joint where the unmistakable racket was coming from, paused then just tried the door. I stepped in and lo-and-behold? There they were having just stopped for a moment! The band looked over, I made some gesture (I forget exactly what) and then a couple of crew or building staff walked over and brushed me out. I remember Brian smiled and waved. Obviously, the idea is that someone "crashed" right into their room like a runaway train. Part of their stage set on this tour is a huge train engine busting through the wall behind the drums - that's me up there :) The memory of that night still gives me a rush. They've always been one of my top 5 faves.