In 2005 and 2006, in Bulgaria, the Bulgarian State Railways begin working Desiro trains as part of a €67-million deal with Siemens AG for a total of 25 Diesel multiple units. As of 22 March 2006, 16 trains had been delivered, with many of them working on the Sofia-Kyustendil-Sofia line. Another €117-million deal for 25 EMUs has also been signed with Siemens AG. The EMUs were fitted out in Varna, where BDŽ and Siemens AG are thinking about making a joint venture company. The EMUs are classes 30 and 31 and are servicing traffic in the Sofia and Plovdiv areas.