London Post Office Railway 1930 Stock

These units comprised the bulk of the fleet from the 1930s until the introduction of the 1980 Stock.

The articulated units were designed to replace the earlier unsuccessful 1927 Stock, which were prone to derailments.

They reused electrical equipment from withdrawn 1927 Stock units.

Due to an increase in traffic levels, ten further units were built in 1936.

All remaining units were withdrawn in 2003 when the system closed.