This canal—11 miles without locks into the centre of Glasgow—was an ideal situation for this venture. Once the boat was planing, the wash that damaged the canal banks largely disappeared, and by 1835, flat iron boats up to 65 feet made 323,290 passenger trips at 10 mph in a year. Services were established on the Forth and Clyde and on the Shropshire Union Canal flyboats with single horse-pulled, 22-ton loads at 10 mph as late as 1847. They were also called "swift boats" or "gig boats".