Original: The Southern Railway (SR) gave the designation 2-HAL to the electric multiple units built during the late 1930s to work long-distance semi-fast services on the newly electrified lines from London to Maidstone and Gillingham (Kent).
Simplified: The Southern Railway (SR) gave the designation 2Hal to the electric multiple units built during the late 1930s to work long-distance semi-fast services on the newly electrified lines from London to Maidstone and Gillingham (Kent).