>>1414241Washington is in a very good position for S-Bahn. The stations are fairly close together, the potential trunk route is there, and some sections are already electrified.
The New York metro area is huge, and so are the distances travelled by LIRR and NJT. They could eventually be turned into something like the RRX (pic related).
Hamburg and Berlin S-Bahn are electrified via third rail as well, but their service is mostly limited to the city.
