This also means that this line is also inaccurate:

> For convenience, they’re actually hanging from the Jubilee footbridges, one on either side of the railway.

It's not for simple convenience: you can see in the photos that it's because the footbridges are taller then the rail bridge and come a bit before it, which allows them to install the straw hanging at the correct height to warn of the constriction before someone hits the bridge itself.