Oshawa's mayor is calling on officials to determine if it is necessary to transport hazardous chemicals through residential neighbourhoods following Friday's train derailment in that city which forced hundreds from their homes.
John Gray also wants to know why a tanker full of hydrogen peroxide was so close to the locomotives, two of which caught fire during the derailment.
He is pushing for some safety improvements along the busy rail corridor but is dismissing suggestions trains should be completely diverted from urban tracks.
Transportation and environment experts are still investigating the cause of Friday's mishap near the Park Road South and Bloor Street overpass. Two lanes of the bridge also remain closed.
The derailment forced more than 1,000 people out of their homes. All have since been allowed to return.
Transportation Safety Board officials say it could be weeks before they know exactly what caused the train to go off the rails.
