The Lionel models of the NYC classes S-1 and S-2 electrics are very, very good. The
#100 was NYC's first electric for the GCT no-more-steam-in-Manhattan project,
is the only member of (electric) class S-1, and still exists - though it is rusting away in the
open in New York state (along with a NYC T-motor). The Lionel S-2 model is accurate in
that Lionel actually changed a few details when it came out. I was ready to buy the
S-3 version (longer frame), but then Lionel started backing away from scale offerings
and decided to put much of its money into endless PW revival pieces...oh well.
The S-1 and S-2 were built as 1-D-1 (2-8-2) electrics, but were unstable at high speeds,
so were converted to 2-D-2 (4-8-4) locos. The S-3 class was built as a 2-D-2 loco,
hence the somewhat longer frame.
I find it strange that the class designations S-1 and S-2 were shared with the Niagaras -
not that you'd confuse the two types, but large railroads are usually pretty OCD about that sort of thing.