Line 3

Line 3 is a line that is missing in the Beijing Subway.

First Planning (1965)
In the first planning, it's colour was green. Line 2 was blue and Line 1 was red. This means that the first planning follows the RGB colour scale (primary colours of light).

Other Scrapped Plannings
In the next few plannings it was yellow in colour and also touches the Capital Airport.

What Happened Instead
Until 2002, the Beijing Subway had only 2 lines. At sometime there were 3 lines but it was deducted to 2 because the Fuba Line (could be line 3) merged into Line 1. Line 3 was skipped and the third line name is Line 13 which served the northern suburbs and the Changping District. Line 13 was yellow in color on system maps like how it is today.