Any maps of St. Louis RR tunnels (or other tunnels)?

[Chris]

I'm a railroad buff and would like to know in anyone has found any maps of RR tunnels underground St. Louis. The ones that Metrolink runs in that go from Eads to the Mill Creek Valley aren't the only ones, but there aren't many more. There is a tunnel between Union Station and the Post Office next door, but I'm sure you can't access it and it only goes under one street anyway. But there