I had not heard of Shaugnessy before, but I'm glad to learn of his work. Another great rail photographer whose books I love is O. Winston Link.
https://en.wikipedia.org/wiki/O._Winston_Link
Shaugnessy, David P. Morgan, O. Winston Link, Lucius Beebe, among other did an amazing job of recording the end of the piston steam industrial era. Industry, cities, methods of trade were fundamentally 18th century in many ways up until the end of the Second World War, when trucking, cars, and road changed the shape of the country.
Remember thumbing through Jim Shaugnessy's The Rutland Road at NY School of Photography years back and admired his b&w composition. Sad that he left us this past August.