In the 1910 recoding the ABAB group were relettered to AB.
This group comprised of carriages with modified interiors to accommodate both First Class and Second Class passengers. Compartments were arranged in various combinations and were not strictly "First Class at one end" and "Second Class the other end" as with some carriage layouts.
There were seventy nine carriages relettered and renumbered in the 1910 coding, one more conversion in 1912 and two more in 1940.
All up, the number group was 1 - 80.
Three interesting carriages were those that came from Joint Stock service. These carriages became AB 78 - 80. They were built as standard 45' cars of the 1890/91 period. The information for these vehicles has been added incorrectly to carriage diagrams which shows them as "Mansard" roof cars. It was only from research at Laverton Public Records Office that data became available. Even the main Register information had recorded the cars as 39'6"; a reflection of Diagram information.
There were continuous conversions to other classes up to 1928. These conversions were to ABC_, _B__, _BC_ and BCM_.
The first scrappings were in 1927. The carriages were scrapped or converted to _WW_ from 1940/41 to 1962.