Near Grove Lock, just south of Leighton Buzzard, it was once joined by Ledburn Brook, which has since been diverted into the Grand Junction Canal (now the Grand Union Canal).
Between 1817 and 1864, the section from Great Linford to Newport Pagnell was an arm of the Grand Junction Canal which was then drained to become the track-bed.
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The Industrial Revolution brought the Grand Junction Canal (now Grand Union Canal) in 1798 and the London and Birmingham Railway in 1837, both located here for the same reasons the road had followed centuries before, seeking an easy gradient over the Chiltern Hills.