Moscow Subway Car "Nailed to the Ground."

English Russia reports in picturesque but readily understandable English:

A while ago there was a story about one Moscow city street advertisement agency.

What made them famous? Their attempt to install a new street ad
stand, so they had to hammer in a concrete pile into ground. They
started doing this and suddenly the pile came down through ground layer
and disappeared somewhere down there.

Yes, they were shocked but they had a task to accomplish so they
started to smash in another pile – it also broke in through the ground.
Now they got really puzzled.

So where have their piles gone? They gone right into a subway train,
nailed a full of people subway train moving at 40mph (70kmh) down to
the ground – right in the middle of the working day. They got extremely
lucky that the subway car in which they hammered in a pile was almost
empty and nobody got seriously injured.

And here are the pilings to prove it: