Original: The Eastern Counties Railway ( ECR ) was an English railway company which began operating on 20 June 1839 with a train service running from a temporary terminus at in Mile End to Romford , now part of the Great Eastern Main Line .
Simplified: The Eastern Counties Railway ( ECR ) was an English railway company which began operating on 20 June 1839 . It ran a train service from a temporary terminus at Mile End to Romford .