Additional to the regular trailers, a project was undertaken to recycle older carriage underframes from the Swing Door conversion project. Some of these frames went to the PL type carriages, but others were used to create the very similar G type cars. These were initially numbered 1G–97G, built 1923–1926 with clerestory roofs, with nearly identical passenger facilities to the T series trailers 400-424. They shared the nine-compartment design seating 94, but where the T cars had three smoking and six non-smoking compartments, the G cars were entirely classed for smoking passengers with four first-class and five second-class compartments. While there is no indication on the relevant diagrams, it seems likely that first class was the east end and second class the west end, to slot between the second-class Motor and first class Trailer carriages when coupled into a seven-carriage set.