I'm looking for reading or book recommendations to learn more about how things were done in years past. Specifically focused on the steam - probably turn of the 20th century to the superpower era is of most interest to me. However, I'm also interested in all things PRR steam, diesel, or hamster wheel.
Books about other roads or more generic books about railroading of the past are that have significant merit would also be fair game. Things like how steam engines and rail cars were engineered, control and signaling systems too, even planning, scheduling, and general operations.
Books I have already read or plan on reading very soon:
Railroads of Pennsylvania: Fragments of the Past in the Keystone Landscape - Lorett Treese
Pennsylvania Steam A to T - Paul Carleton
Pennsy Diesel Years 1 and 2 - Robert J. Yanosey
Pennsy Power I and II - Alvin R. Staufer and Bert Pennypacker
The Pennsylvania Railroad 1940s-1950s - Don Ball Jr.
Photos are great - but I would like books that talk more about specifics, what worked, what didn't. Why things "are they way they are."
Thanks in advance!