I am thinking:

• Parramatta station will melt and warp
• The metro control system will get confused by ice
• A light rail vehicle will separate at the middle into two independent trains.
• A stampede of 100 friday workers will pick up and carry a bus over an intersection to get around a traffic collision.
• A vehicle will be spotted operating on the wrong type of tracks (might be LR/metro/HR/car/sideways-crane).