[6][note 1][7][8] During the construction period, heavy rains in October 1855 swept away two bridges being built over the River Tees by the contractors.

[10] The line was originally single track from the junction at Hopetown, west of North Road station, and was worked in one section by staff and ticket to Barnard Castle.

[18] The line was single through Broomielaw with a junction to provide double track at the western end of the station area.

[23] Traffic on the line increased during the Second World War with numerous training camps being built in the Barnard Castle area.

[24] After the Stainmore Line had closed, the D&BCR was kept open for trains to the branch beyond Barnard Castle into Middleton-in-Teesdale which covered a distance of 25 miles (40 km).

[27][28] The branch did not open until February 1867, and even then was delayed in forwarding traffic as the track had not been ballasted properly or been engineered correctly.

[36] The trackbed of the former railway was adapted into the northern carriageway of the A1(M) bypass around Darlington in 1965 with the defunct quarry at Barton being used as a motorway interchange.

[37] On 24 October 1905, a train from Darlington bound for Tebay had just left Gainford station when it derailed and slid down an embankment.

Injuries were only slight, so a recovery operation was launched immediately as a Royal Train was due on the line later on the same day.

The cause of the accident was due to several factors; a track working gang had removed a rail from the running line after misreading the timetable and not expecting the train to be there.