In the tunnels with the tram I found the teddy bear on a box of dynamite guarding a brick wall. A sign says "you will not pass" After a few tries I managed to send the tram in and run the other way without dying. I return to examine the wreck and maybe go through the new hole, but nothing. Everything is intact, the tram still runs, and I can even run into the unscathed and now inert box of dynamite. Didn't hinder my progress, but thought it was worth sharing. Would be interesting if the entire thing collapsed forcing you to go on by foot.