What is the fine-grained topic of the following text: The Foundry also developed custom typefaces, marks and logotypes for companies internationally those included: a special typeface to be readable at very small sizes for Yellow pages, corporate fonts for BG plc (British Gas) NatWest Bank and signage typefaces for both RailTrack in the UK and the Lisbon Metro system in Portugal. Only return the topic.
Custom Typeface Development for International Companies