The final gradient from Camden Town to Euston involved a crossing over the Regent's Canal that required a gradient of over 1 in 68. Because steam trains at the time could not climb such an ascent, they were cable-hauled on the down line towards Camden until 1844, after which they used a pilot engine. The L&BR's Act of Parliament prohibited the use of locomotives in the Euston area, following concerns of local residents about noise and smoke from locomotives toiling up the incline.