The Widened Lines, 1869.

On the Metropolitan from Paddington the section between King's Cros and Farringdon Street was originally used also by Great Northern trains. When the line was extended to Moorgate it was decided to give the Great Northern an independent route to that station. Illustration shows a Metropolitan train from Moorgate about to enter the original tunnel on its way to King's Cros, while at the lower level a Great Northern locomotive, having just left the new tunnel, is on its way to Moorgate. The group of four lines together became known as the 'widened lines'. Illustration first appeared in the Illustrated London News.