In about 1984, the Joint Stock 'Overland' Twinette sleeping berth cars were split into two groups: JTA_ and JTB.
The JRA class cars were built first and hence the oldest cars in the group.
Cars JTB 1 to 4 were converted from Tawarri, Yankai, Weroni (2nd) and Dorai.
File c421m compiled by Peter J. Vincent, updated 11/11/2007, checked 07/03/2026