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provided the most direct route between , on the existing Great Northern route, and in the City of London. Following completion of the electrification to Welwyn and Hertford, the London terminal for all inner-suburban services would switch from King's Cross to Moorgate, reducing the number of train movements at the former station enough to permit the remodelling and subsequent electrification of the complicated approach tracks. The Northern City Line tunnels, however, were still not large enough to be fitted

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