Editing London Underground (section)

===Johnston typeface===
{{Main|Johnston (typeface)}}
The first posters used various typefaces, as was contemporary practice,{{sfnp|Ovenden|2013|p=21}} and station signs used [[sans serif]] block capitals.{{sfnp|Ovenden|2013|p=23}} The Johnston typeface was developed in upper and lower case in 1916, and a complete set of blocks, marked Johnston Sans, was made by the printers the following year.{{sfnp|Ovenden|2013|p=112}} A bold version of the capitals was developed by Johnston in 1929.{{sfnp|Ovenden|2013|p=122}} The Metropolitan Railway changed to a serif letterform for its signs in the 1920s, used on the stations rebuilt by Clark.{{sfnp|Ovenden|2013|p=139}} Johnston was adopted systemwide after the formation of the LPTB in 1933 and the LT wordmark was applied to locomotives and carriages.{{sfnp|Ovenden|2013|p=156}} Johnston was redesigned, becoming New Johnston, for photo-typesetting in the early 1980s when Elichi Kono designed a range that included Light, Medium and Bold, each with its italic version. The typesetters [[P22 type foundry|P22]] developed today's electronic version, sometimes called TfL Johnston, in 1997.{{sfnp|Ovenden|2013|p=250}}