However , by October NUMBER@1 the date for the first train entering service had slipped to January NUMBER@2 , and the first train entered service on NUMBER@3 July NUMBER@2 , leaving the depot at NUMBER@4 and forming train NUMBER@5 leaving Seven Sisters at NUMBER@6 to LOCATION@1 .

However , by October NUMBER@1 the date for the first train entering service had slipped to January NUMBER@2 . The first train entered service on NUMBER@3 July NUMBER@2 , leaving the depot at NUMBER@4 and forming train NUMBER@5 leaving Seven Sisters at NUMBER@6 to LOCATION@1 .
