Since 2005 RVR of Riga has been building DMUs for the Belarus state operator, BCh. Although designated Class DR1B, they are in fact being built in two versions. As we reported in R 3/06, p. 11, two 6-car units (DR1B-500 and 501) were delivered in winter 2005/6 for inter-city services. From early August 2006 they have been followed by four 3-car sets (DR1B-502 to 505) for middle distance services, and this quartet should be in Belarus by the end of the year. Production continued in autumn 2006 with DR1B-506, which is another 6-car unit for middle distance services, and four more of this type will be delivered to BCh during 2007.