I have a couple of questions about the external lights on the '09 stock.

A few weeks ago, I saw a disabled '09 train limp into a station. Just
above the right headlight (driver's side), there was a red light that
was flashing.

Anybody know what that light's for? I would assume that it is a newer
version of the handbrake light, but the fact that it was flashing makes
me wonder.

I also wanted to know something about the guard lights mounted on the
side of each railcar, which can display red and white in two different
lenses.

I know that red will indicate if a door is open. But what does the white
one indicate, that the alarm in that particular railcar was activated?