The five-mile-long tramroad comprised a double-track plateway, except for a short section of single track through a tunnel under Fishergate in Preston, just south of the canal basin. The iron rails were ‘L’ shaped in section and were spiked to large limestone blocks. The wheels on the wagons were not flanged and it was the vertical section on the iron rails that kept the wheels on the track. The gauge was 4 foot 3 inches (1295 mm) between the verticals, which were on the inside of the track.