"These types of events are deeply traumatic for those involved, and our thoughts are with all those affected," Gordon said.
"In line with our standard practice, our locomotive engineer has been put on leave and will be offered counselling and any other support needed from KiwiRail."
The line remains closed and there will be disruptions to freight services between Hamilton and Tauranga.
Fire and Emergency NZ confirmed they were called to the scene to assist ambulance staff.
An area has been cordoned off heading to Frankton Station.
Two Hamilton City Council gardeners working in Fraser St were asked by an ambulance crew to block off the road and cycleway. The pair were not told why.
18/01/22 08:13: Traffic incident in Frankton, Hamilton. For more details refer to Police . https://t.co/jZKcewv3sK