Adding up the metropolitan areas around the NE corridor, there are ~40 Million people living there, around half of Germany. The NE corridor includes 611km of electrified track (or 1500km for all electrified rail in the US, adding up all the numbers mentioned in the Wikipedia page).

In Germany 20000 km are electrified, so around 25cm per inhabitant. In comparison to the NE corridor with a number of 1.5cm per inhabitant, this is a huge difference. To account for other railways inside the NE corridor, we can also just use all electrified rail as a reference and arrive at 3.7cm per inhabitant).

And Germany hasn't been great about electrifying it's rail.

I'm pretty sure we also don't have equal rail density in all regions. So this is just the average. Nevertheless I'm not sure how this can swing a factor of two hundred. (If I use rail length per capita instead, which somewhat compensates for unpopulated regions, the advantage is still ~1.4x for non-electrified and ~50x for electrified rail.)

Also, is there any statistics for this northeast corridor, regarding region area, electrified, and non-electrified rail length? I only know where to get national statistics, so that doesn't help me a lot here.