It's a light at the end of the tunnel

And if it's not the end (of the tunnel) it's another train!
This is a shot I have tried several times to get, but I 've never been satisfied. Neither this time, but the best so far. The challenges is that it's totally dark unless there is a train coming. Then some trains have full light and others dimmed. And the focus, and then that I must not stand in front of the signal lights... Maybe that's why I just have to get THAT shot. I probably get back to this.
It's taken with a Gorillapad and crossed fingers.
(Marcello, this is the shot I have talked about.)
Forgot to mention, this is the subway, Stortinget station towards Nationalteateret.