Wishing you Best on your journey Abroad, I wish to say, the data on delay in arrivals is not available now. Further predictions on untoward happening can not anticipated. Hence precaution is the best way to avoid 'disappointment' of missing the flight.
As your boarding station is not clear to me, I am not able to suggest alternative train either. I feel best way would be to arrive One day in advance and relax for while, and put up in hotels where connectivity to Airport is easy.