About the Johnston Sans typeface
The typeface should have “the bold simplicity of the authentic lettering of the finest periods” Pick wrote to Johnston. It should also, he told him, be easy to read from a moving train and in bad lighting, be noticeably up-to-date with the times, and yet also be completely different from anything found on other shops and signage. Finally, in true Frank Pick style, Johnston was told that each letter should be “a strong and unmistakeable symbol.”
The story behind the Underground typeface and its redesign, needed due to the emergence of digital print.