Brunel estimated that by reducing the double track locomotive worked line to a single track atmospheric line a saving of ?, 000 per year could be made.
2.
As part of the works for the atmospheric system, the world's first railway flyover was constructed beyond the south end of the station to carry the atmospheric line over the conventional London & Brighton Railway steam line.
3.
As part of the construction works for the atmospheric-propulsion system, the world's first railway flyover was constructed at the north end of Portland Road, to carry the new atmospheric line over the conventional steam line below.
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