An ill-timed, slow-moving train in Pennsylvania has derailed some runners' dreams of competing in the next Boston Marathon.
The Lehigh Valley Health Network Via Marathon was underway Sunday when a train crossed the race course near Allentown, stopping some runners for minutes.
Marathon organisers said they gathered information from affected runners and shared it with the Boston Athletic Association.
But the association said Wednesday it cannot accept any adjusted race times.
Only the official times recorded Sunday will count for determining which participants qualified for the Boston Marathon.
Via Marathon officials said they had received assurances a freight train would not affect the race, and apologised to runners for the disruption.
Registration for the Boston Marathon began Monday.