The station platforms on the below grade stations are still mostly intact, but the line is "returning to nature," with lots of trees and vegetation smothering everything. The stairs were torn down (and most are probably just laying in pieces in the trench) when the street overpasses were re-done. You used to be able to see the Harbor Road station (between Harbor Rd. and a walkway to Lockman Ave.) from Harbor Road, but this was obliterated when the new freight tracks were installed at the old Arlington Yard location for Howland Hook container port and trash transfer services. You can see the Mariner's Harbor station (center platform, between Van Pelt Ave. and a walkway from the end of Maple Parkway that no longer exists) from Van Pelt Ave., the Lake Avenue station (between Simonson Ave. and Lake Ave.) from Simonson Ave. or Lake Ave., and the Elm Park station (between Morningstar Rd. and walkways to perhaps Eaton Pl. and Newark Ave., not sure - beneath the Bayonne Bridge) from Morningstar Rd. A brick station building on Morningstar Rd. unfortunately appears to have been destroyed when the bridge was re-done. After that, the line comes out of the trench onto a concrete viaduct (still intact) with the elevated platforms atop the viaduct still visible from the street. These include Tower Hill station (visible from Treadwell Ave.) and Port Richmond station (between Port Richmond Ave. (formerly Richmond Ave.) and Park Ave.). After that, the line goes down to grade level through the industrial waterfront, with the stations (West Brighton, Livingston, Sailors Snug Harbor, and New Brighton) largely eradicated (probably wood construction, which was more easily wiped away when no longer in use). Some steps and a plaque exist at the site of the Sailors Snug Harbor station, but I think that's about it. Portions of the waterfront ROW have also been washed away over the years since abandonment of freight operation over the line to St. George and beyond on SIRT trackage rights. The fairly new Ballpark station is right next to the terminal in St. George for the new minor league ballpark built there on part of the former B&O railroad yard site.
Much of the North Shore Line is in rougher neighborhoods, so exercise due caution if you go on a "tour."
GE, not EMD, makes the best locomotives now; has for over 20 years. Get over it.