Plate 179 is an elevation view looking north of the southern end of Lazonby tunnel (/location-summaries/structure-292310) - bridge No 305 - 292 miles 25 chains. The 99 yard long tunnel was constructed with stone side walls, invert, arch and faces. It was originally planned to have a cutting here, but a tunnel resulted, and was cut during 1871 and 1872.
To the right in the picture is the platelayers’ hut (/location-summaries/structure-292300) on the land adjacent to the Sand Siding (/location-summaries/structure-292270) (and is shown in Figs 69 and 70).