So here is the result of my follow-up research on NYC Subway /PA PATH train evacuation procedures/possibilities. First neither NYC or PA publishes anything near as informative re rescue or evac, as does the DC Metro website. Their bad. They're probably afraid of encouraging bad exploratory behavior, etc.

Most of my emergency / survival books have little or nothing on this subject. An exception is Aton Edwards' "Preparedness Now" , "Expanded and Revised Editon" (2009). Strange. I am generally underwhelmed by this book, but he is ahead of the pack on this issue.

I did find an interesting & informative U-Tube video entitled, " How to survive a fall in the subway tracks NYC". This video purports to identify how to get back on the platform and the safe(r) refuges in between, under, & alongside the track, but does not mention ducking under the platform ledge? Is that not viable?

What appears to be the fullest info is contained in two entries on the ITV Squad. com website. One entry on evac to the surface and one on falls onto the track, including instruction on how to signal an oncoming train to stop.

NOTE THAT I CANNOT AND DO NOT VOUCH FOR THE SAFETY OR CORRECTNESS OF ANY OF THIS INFORMATION. CAVEAT EMPTOR!