London and Blackwall Railway
The L&BR was leased by the Great Eastern Railway in 1866 , but remained independent until absorbed into the London and North Eastern Railway at the 1923 Grouping . 
<triplet> Great Eastern Railway <subj> London and North Eastern Railway <obj> followed by <triplet> London and North Eastern Railway <subj> Great Eastern Railway <obj> follows <subj> 1923 <obj> inception