:I'm not sure what you intend the photos to convey. They show steel stringers that look like they're 14 metres long and span the path formerly taken by the rail lines. However the text makes clear that the stringers were originally of timber, and the "beams" supported them. So it's in the historical context that we're discussing the beams and they cannot be the same as the girders shown in the photos since these girders must have been added later when the bridge was upgraded.