From the start of Yard Limits at Crystal Lake Junction (MP 42.8), where the line north to McHenry departs the main line, a grade crossing with East Crystal Lake Avenue just beyond the junction, a bridge over a line that trails into the McHenry Line just to the north, and is now a 2-mile industrial spur to the south (that once went through to Elgin), with an erstwhile west quadrant connector as well, through what is now a parking lot, a grade crossing with North Main Street in another suburban interlude, the Metra station at Crystal Lake (MP 43.2), with two side platforms, depot and most parking to the south, and a grade crossing with Grant Street within the platforms, where many of the trains terminate and where there is a two track storage yard for Metra trains on the north side, west of the station, including a grade crossing at North Walkup Avenue, after which Yard Limits end, the main line continues northwest, Double Track, current-of-traffic, Automatic Block Signals, Automatic Train Stop, with overall speed limit 70 mph for passenger trains and 60 mph for freights, bridging over West Terra Cotta Avenue out into the now-bucolic countryside, with Crystal Ridge Drive briefly alongside to the north.
There are Intermediate Signals, an industry with a couple of south side tracks, a grade crossing at North Oak Street, countryside, a rail-served plant to the northeast with a spur heading away, a rail-served plant on the south side with a west-facing spur, Intermediate Signals, Ridgefield Road alongside to the south and Railroad Street alongside to the north, a grade crossing at Market Street, Intermediate Signals at Ridgefield (MP 46.0), rail-served grain silos with two extra tracks on the south side, countryside, a detector at MP 47.4, a grade crossing with Lily Pond Road, ponds to the southwest, Intermediate Signals, housing to the north, a spur trailing in from the south, a rail-served plant with two extra tracks on the north side, two spurs curving away to industries on the north side, Intermediate Signals, a spur trailing in from industry on the south side, a bridge over South Eastwood Drive, and a bridge over a stream.
The line continues northwest, past a bridge over East Kimball Avenue, Lake Avenue alongside to the southwest, East Lake Street alongside to the northeast, as the line angles north-northwest and Lake Avenue turns away, a grade crossing with East South Street, a grade crossing with East Calhoun Street, a grade crossing with South Madison Street, a former depot to the northeast, a grade crossing at the intersection of North Jefferson Street and East Judd Street, a grade crossing with North Benton Street, a grade crossing with East Church Street (SR 120), a Metra station at Woodstock (MP 51.6), with two side platforms and depot to the southwest, a grade crossing with Wheeler Street, a grade crossing with Short Street, and a grade crossing with a north-south street.
There are industries on both sides, without rail connections, countryside, a grade crossing with Lamb Road, a grade crossing with Ross Farm Road, a grade crossing with Nelson Road, a road briefly alongside to the west, a bridge over drainage, Intermediate Signals, Hartland (MP 56.0), a grade crossing with Deep Cut Road, a bridge over a stream, a grade crossing with Strett Road, a turn northwest, a grade crossing with McGuire Road (Country 16), a curve west-northwest, a grade crossing with Schultz Road, until reaching the exurban town of Harvard, with a grade crossing with East Brink Street, Intermediate Signals at MP 62.3, a grade crossing with South Jefferson Street, a speed restriction of 30 mph between MP 62.4 and MP 62.9, extra track on the south side, Railroad Street alongside to the north, Division Street (US 14) bridging overhead, a grade crossing with South Ayer Street (MP 62.750 as the line turns northwest, with the speed limit dropping to 10 mph at MP 63.0 before the Metra station at Harvard (MP 63.1), with two side platforms and depot to the northeast (at the foot of North Eastman Street). Just northwest of Harvard, the line singles and splits into two, one line turning west, heading just a few miles, and the other, continuing northwest to Janesville and Madison, WI, crossing West Diggins Street at grade.