The diagrams below are taken from a leaflet previously published by Harpenden Town Council, St Albans City and District Council, Redbourn Parish Council, Dacorum Borough Council and Countryside Management Service. They are slightly out of date in some places but used here as a simple introduction to the Line and with updated section notes.
Section Notes (See numbered points on the diagram):
Harpenden is still considered by many as a large village which grew in size after the arrival of the railways. Harpenden at the turn of the century became increasingly attractive to London commuters but still retains much of its countryside feel with 250 acres of commons and greens.
A steep cutting joined the original branch line to the mainline railway to London and the Nickey Line starts off Hollybush Lane with a steep and high set of steps down to this attractive section of the Line. Cyclists may prefer to join the Nickey Line using the ramp at Ambrose Lane or from Moreton End Lane where access can be gained avoiding steps.