The two boats may operate only with an independent safety monitor on board.

The first boat operated on part of the canal in April 22, 1802.

The trip along the river normally took about 40 minutes and the boat operates from 8pm to 10pm depending on demand.

At different stages four or five boats would have operated.

The boat operates with two 1,300-horsepower engines and can reach speeds of more than 120 miles an hour.

Later, this part of the city became the waterfront where fishing and other commercial boats operated.

While the boat was operating without incident, the team decided early yesterday that time had run out.

The boats operate 24 hours a day, 365 days a year and have been a vital municipal service since 1905.

These boats could operate faster, deeper and had much longer endurance.

In the peak year of 1851 400 boats were operating.