Passenger carriage Da, Cai ČSD (Eight-Door) H0

Originally supplied as Cai and Bai, the By series cars were a range of spacious passenger cars designed exclusively for domestic service, particularly local passenger train services. They were manufactured by Tatra Smíchov for the Czechoslovak State Railways (ČSD). They were phased out of passenger transport in the 1990s. They are known under the name eight-door for their characteristic wide boarding platforms with Osmidveřák.