Indeed, I used it earlier to find out the service I wanted was 3 minutes late when the departure board said it was on time!
(then NRES: 4 mins, board:4 minutes,
NRES:10 mins, board: 4 minutes,
NRES:13 mins, board: 8 minutes,
NRES:20 mins, board: 10 minutes,
NRES:Cancelled, board: Cancelled!)
(how can the departure board say the train is 'On time' 30 seconds before it should arrive and a full 3 and a half minutes after it should have left the station before I do not know... another thread maybe!)