there is a lot of information on condensed profile. i am familiar with the milwaukee road condensed profiles and the chicago and north western condensed track charts and i would assume the sp and something similar.
the term “profile” means a view of the track from the side showing the elevations of the line and the condensed profile shows that but it shows much more than that. it also has a straight line diagram of the main line which shows curves by showing the beginning and end of the curves and the sharpness of the curves. it shows sidings, industry tracks, stations, bridges, culverts, highway crossings and crossings of other railroads. it may show the weight and year of manufacture of the rail and ballast.
let me know if you have any specific quesitons.
bye. Larry