It's rare that railroad projects are documented in vast detail from the perspectives of civil engineering, economics, and social impact in a single book. "Der Tunnel" is one of the exceptions. It describes design and construction of the central element of the S-Bahn Stuttgart: The city tunnel between Hauptbahnhof (main station) and Schwabstrasse, and it's underground continuation to Vaihingen via Universität. In over 35 detail-loaded chapters the authors work through early plans and financing of the project, discuss in detail the various construction sites within the city core, including engineering challenges of constructing a tunnel in the middle of a bustling city with difficult geology. They keep the high level of detail as they discuss the concerns and engineering challenges building the Hasenbergtunnel towards Vahingen. Along the way they touch on such diverse topics as re-routing of sewers, tram lines, and car traffic; digging next to, or under, historic buildi...