22) ... and that’s what is going on here. This picture taken at Pilning, on the main line between London and South Wales, near the Severn Tunnel, shows how track laid nowadays is already assembled.

The special crane you see travels up and down the neighbouring track lifting up the old track bodily in rail lengths, and putting new, pre-assembled lengths of track in place.

The fiat wagons which brought the new track are used to take away the old.

The track shown here is the well-known bull-head type of track that has been used so long by British Railways.