Solve for X

I sit in a railway car
With three other passengers
When the lights go out
I feel a hand on my shoulder
Lights on and it's not
The woman in the brown sweater
Nor is it the man in the business suit
The man with the briefcase has not moved
And the hand could be my own
But we're not on the tracks anymore
And all I can think is that
I must have left something plugged in
Before I left