...and for all those who are similarly obsessed with details as I am, check this out:
The "old" train line of course still exists, but it now enters a tunnel just by Victory park, and re-appears between the Guttmann Health Centre and Chobham Academy (see my red & blue dots. The train line is very well visible on Google Maps & Google Earth, btw) and that's the curve one can see so well on the old photo. And the orange dots show the DLR, by the way.
Obsessed as I am, all that helps me a lot with locating stuff, e.g. Victory Park. And it's good fun to know that Liberty Bridge Road now covers that train line. So thank you very much, Nick & Frank. I just love that kind of stuff.