Underground Pro is kept as intended by Johnston and remains within his system of proportions. Additional OpenType features, such as Small Caps and Petite Caps, are included in 6 weights- Thin, Light, Book, Medium, Demi and Heavy. A Titling option that mimics London Transport signage is offered in the medium weight. The addition of many unicode ranges for unprecedented language support makes this the most expansive P22 font family ever. Each Pro font weight collectively contains over 5000 glyphs, covering most Latin based languages. The outlines of the original Regular and Bold have been subtly redrawn and expanded, they are now available as Medium and Heavy respectively.