 This section was designed for atmospheric propulsion, rather than steam haulage, and consequently has curves and gradients that would not be dreamed of for a loco-hauled line.The westbound ascent to Dainton Tunnel includes gradients between 1 in 57 and 1 in 36 over a two-mile stretch.Eastbound is slightly easier, comprising, in the space of one mile, gradients of 1 in 55 to 1 in 37.