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NZR Passenger Coaches

New Zealand Rail (NZR) passenger coaches by Frateschi.

The stepped center sill section (the clerestory) that ran the length of the car and extended above the roof sides by as much as a foot. This section of the roof usually had windows or shutters that could be opened for ventilation while the train was in motion. However, railroad crews and passengers quickly discovered that when these windows were opened on a passenger train pulled by one or more steam locomotives, smoke and soot from the locomotives tended to drift in through the windows, especially when the train went through a tunnel.