E. E. Rusel Tratman, Railway Track and Maintenance, Original printed in 1926, Kalmbach Memorial Library NMRA, ISBN 0-9647050-6-0 It's still the best way to learn from the real thing.
Kent Johnson et al, Trackwork and Lineside Detail, Kalmbach Publishing, ISBN 0-89024-71-1 The best of from Model Railroader to this topic.