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.