You might also be interested in the story of SISCOG (http://www.siscog.eu/upload/GESTAO-DE-LISTAS/News/PDF/eclm-2...) - a massive transport infrastructure system designed in Common Lisp. I'm sure Clojure would have been chosen if it was developed today.
2013 is just the publication date. The document cites an implementation of their London Underground system which has been in production since 2008 and a another within the Dutch rail system dating back to 1998.