 The train was removed from the tunnel two hours later by a relief locomotive from the Featherston end after a haphazard response on both sides of the tunnel.There were no injuries, although some elderly passengers required medical treatment due to the distress of the event.After the incident, changes were made to the Train Control telephones so they would self-test and track occupancy rules were modified to allow trains to coast out of the tunnel (which has a gradient of 0.25% to 0.55%) if they became disabled.