Canal changes to the south bank while it passes through the Osberton Estate, as the Foljambes, who lived in Osberton Hall, did not want boatmen passing too close to their residence. On canals, one solution to the problem of getting the horse to the other side was the roving bridge or turnover bridge, where the horse ascended the ramp on one side, crossed the bridge, descended a circular ramp on the other side of the river but the same side of the bridge, and then passed through the bridge hole to continue on its way. This had the benefit that the rope did not have to be detached while the transfer took place. Where the towpath reached a lock, which was spanned by a footbridge at its tail, the southern section of the Stratford-on-Avon Canal used split bridges so that the horse line did not have to be detached. The rope passed through a small gap at the centre of the bridge between its two halves. One problem with the horse towing path where it passed under a bridge was abrasion of the rope on the bridge arch. This resulted in deep grooves being cut in the fabric of the bridge, and in many cases, the structure was protected by cast iron plates, attached to the faces of the arch. These too soon developed deep grooves, but could be more easily replaced than the stonework of the bridge. While bridges could be constructed over relatively narrow canals, they were more costly on wide navigable rivers, and in many cases horse ferries were provided, to enable the horse to reach the next stretch of towpath. In more recent times, this has provided difficulties for walkers, where an attractive river-side walk cannot be followed because the towpath changes sides and the ferry is no more. Not all haulage was by horses, and an experiment was carried out on the Middlewich Branch of the Shropshire Union Canal in 1888. Following suggestions by Francis W. Webb, the Mechanical Engineer for the London and North Western Railway at Crewe Works, rails were laid along a stretch of the towpath near Worleston, and a small steam locomotive borrowed from Crewe Works was used to tow boats. The locomotive ran on gauge tracks, and was similar to Pet, which is preserved in the National Railway Museum at York. It pulled trains of two and four boats at