, and experiments were also tried with eight boats. The canal's engineer, G. R. Webb, produced a report on the expected costs of laying rails along the towpaths, but nothing more was heard of the project, and the advent of steam and diesel powered boats offered a much simpler solution. The 'mules' which assist ships through the locks of the Panama Canal are a modern example of the concept. Modern usage Towpaths are popular with cyclists and walkers, and some are suitable for equestrians. In snowy winters they are popular in the US with cross-country skiers and snowmobile users. Although historically not designed or used as towpaths, acequia ditch banks also are popular recreational trails. Britain In Britain, most canals were built, owned and operated by private companies, and the towpaths were deemed to be private, for the benefit of legitimate users of the canal. The nationalisation of the canal system in 1948 did not result in the towpaths becoming public rights of way. Subsequent legislation, such as the Transport Act 1968, which defined the government's obligations to the maintenance of the inland waterways for which it was now responsible, did not include any commitment to maintain towpaths for use by anyone, however, some ten years later British Waterways started to relax the rule that a permit was required to give access to a towpath, and began to encourage leisure usage by walkers, anglers and in some areas, cyclists. The steady development of the leisure use of the canals and the decline of commercial traffic has resulted in a general acceptance that towpaths are open to everyone, and not just boat users. The concept of free access to towpaths is now enshrined in the legislation which transferred responsibility for the English and Welsh canals from British Waterways to the Canal & River Trust in 2012. Cycling permits are no longer required by the Canal & River Trust. However, not all canal towpaths are suitable for use by cyclists, and conflicts can arise between the differing user groups, leading to campaigns such as Stay Kind, Slow Down. Parts of some towpaths have been incorporated into the National Cycle Network, and in most cases this has resulted in the surface being improved. List of towpaths Illinois and Michigan Canal Chesapeake and Ohio Canal Trail Forth to Firth Canal Pathway along route of the Falkirk Wheel. D&R Canal Trail Thames Path Erie Canal