Welland Canal Port Maitland. With the opening of the extension, the canal stretched between the two lakes, with 40 wooden locks. The minimum lock size was , with a minimum canal depth of . Deterioration of the wood used in the 40 locks and the increasing size of ships led to demand for the Second Welland Canal, which used cut stone locks, within just a few years. In 1839 the government of Upper Canada approved the purchase of shares in the private canal company in response to the company's continuing financial problems in the face of the continental financial panic of 1837.
Welland and was also used by the Wabash Railway. Later, it became the Cayuga Subdivision of the Canadian National Railway. Lastly, the Niagara, St. Catharines and Toronto Railway provided electric interurban service from Port Colborne, Ontario to Thorold, Ontario via Welland. Passenger service ended in November 1959, but the tracks remained in freight use until 1981 when a trestle over the Welland River became unsafe and the line was removed from service. The relocation of the Welland Canal in the early 1970s caused massive changes in the local railway network. The new route of the canal was previously crossed by five