British Rail Midland Region London Rugby Line Bridge Number 114 (Parkhill Bridge)

Parkhill Bridge is a road bridge over the railway at Tring Cutting, built around 1837 by Robert Stephenson for the London and Birmingham Railway Company. The bridge is constructed of brown brick and features stone impost bands, skewbacks, a cornice, and parapet copings. It has a long, narrow design with three arches that carry an access road across the deep Tring Cutting, which is approximately 2½ miles long and about 50 feet deep at this point.

In the center, there is a higher seven-ring segmental arch over the trackbed, supported by slender rectangular piers at the base of the earth slopes on either side. Each pier has a tall opening with round arches at both the top and bottom. The segmental side arches leading to the abutments are slightly lower and are concealed within the earth slope. At roadway level, there is a wide unmoulded stone cornice, brick parapets, rectangular terminal piers, and weathered stone copings.

The cutting was created due to Stephenson's decision to maintain a maximum gradient of 1 in 330 on the line. A well-known lithograph by J.C. Bourne depicts the extensive excavation work carried out by laborers, known as navvies, during its construction. The railway line was officially opened on April 9, 1838.