The Great Wall of Todmorden was built in 1881 as a retaining wall, possibly due to the subsidence of the hillside, but also to support the enlarged station goods yard, including sidings for the Fieldens' Waterside Mill.
Once you've listened to the commentary continue your journey.
Walk alongside the canal until you reach Shade Lock 21. Here is a splendid view of the Skew Bridge with the Gauxholme locks visible beyond. The bridge, which has ornate castellated turrets, is a striking example of a skew railway bridge.
Here is a good place to listen to the next track.