Original: In 1902, it decided to build a subway from Theobalds Road in the north to the Embankment underneath Waterloo Bridge to the south, from where a surface line would continue over the bridge.
Simplified: In 1902, the Council decided to build a tramway that was under the ground (subway). The subway went from Theobalds Road in the north to the Embankment underneath Waterloo Bridge to the south.