JRB 1 and 2 were recoded from 'Overland' Roomette cars named Allambi and Tantini respectively.
In about 1984, the Roomette cars were split into codes JRA_ and JRB.
The class difference is the age of the cars. Older cars were reclassed to JRA.
File c419m compiled by Peter J. Vincent, updated 11/11/2007, checked 20/2/2026