It's possible that your grandma used Isaly's sauce for this. It is still available and it has directions. Sweet or dill relish are recommended choices. And potato buns. It takes 5 minutes and grandma will appreciate it.

There are Union plumbing/hvac shops in pittsburgh. Their techs aren't on commission like many of the large non-union places. The labor costs suprisingly are often less at union shops. Ask when you call.

As long as the problem is a fire or hazmat incident, the fire department will be blocking the lane in the other tunnel when they arrive. They will also be attacking the problem through those doors. Please call 911 immediately or use the emergency phones in the tunnel if this happens. Please describe the side involved (inbound/outbound, and station or distance marker) to ensure a response that will help you faster.