Hart was attracted by the geometric patterns of light and shadow produced by unsheathed bridges and snowsheds.
The first snowsheds were left open on the sides, but snow which drifted in was difficult to remove, so they were soon sheathed completely. Narrow gaps were left between the side boards, to allow some light and ventilation, and some roof boards were removed in the summer for the same purpose. The sheds were always gloomy, but in the winter, when snow piled up against the sides, blocking all the gaps, the snowsheds were as dark, cold, and smoky as a tunnel. Passengers despised them for blocking out the vistas, and crews were annoyed by the smoke and the difficulty of signaling.
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