"A bus which was used to transport the Bristol Brass Band, crashed through the railing on Riverside Avenue. The hood of the bus is in the Pequabuck River. The gas plant of the Bristol & Plainville Tramway Company can be seen on the right. The Down Street Bridge is visible on the left in the rear of the picture."
Clearly that upstream gas plant contributed to a powerful morphogenic field to attract or even compel the bus ineluctably into the mire of the river-bed. Let the Whackyweedia explain the Pequabuck River's unhygienic nature:
The river's lower drainage basin consists of industrial and urban areas, effluents from these areas pollute the river's water"What are you on about?" Another Kiwi vouchsafed.
"Where there's muck there's brass," I explained.