Canal maintenance craft, tugs, dredgers, ice-breakers
When the canals were in full commercial operation, carrying goods of all descriptions in all directions, the vast majority of canal boats obviously had to be cargo boats, carrying the stuff that paid the wages. But the canals had to be maintained to do their job and that required a supporting fleet of workboats, designed for specific tasks.
Tunnel tugs were stationed at most of the main tunnels to haul trains of boats through whilst the horses were walked over the top.
Dredgers were required to maintain proper depth, from little 'spoon' dredgers operated by a crew of men with a big scoop on a long handle hung over the side to a variety of mechanical ones - steam operated grab cranes to giant endless chain bucket dredgers operating in the docks. Each needed its own mud boats and hoppers, whilst the carpenters and painters needed boats for their tools and their tea breaks.
The greatest threat of disruption to canal traffic was ice. A spell of severe cold weather could soon bring the canal to a halt if the ice was not kept broken, so most canal companies kept a number of specially built ice breakers to be brought into use in a freeze-up.
Massively built, heavily plated with a long raking bow designed to ride up on the ice before smashing down through it, these important emergency vehicles were kept working for as long as possible to keep the traffic moving. More and more horses were attached as the ice got thicker, and some old photographs record as many as sixteen horses dragging a single boat through the ice. Finally the boat would come out on top of the ice and that was that. Traffic stopped, factories ran out of supplies, tonnage tolls were not paid and the boatmen had no way of earning a living. A severe canal freeze up was a very serious matter indeed.
The majority of the time however these strongly built boats did very little, and consequently a lot of them survive in surprisingly good condition.
A few complete ones are in museums but many more have been motorised and converted and make canal cruisers of great character.