The Railways Act 1921, which became law on 19 August 1921, did not list any of London's underground railways among the companies that were to be grouped, although at the draft stage the Met had been included.
Jernbaneloven fra 1921, der blev lov 19. august 1921, angav ikke nogen af Londons underjordiske jernbaner blandt de selskaber, der skulle grupperes, selvom at Met-banen var inkluderet i et udkast til hertil.