I'm not sure where the next section is but the North Wembley junction was in use, so that section was live. I believe dets were set South of the Harlesden Junction, but that doesnt mean the line wasn't isolated further up I suppose. The DF was back in service pretty soon after the broken train was cleared so I'm presuming that section was also energised. Only the UF remained blocked all day. I also really can't understand why LNWR service deteriorated so badly *after* the failed train was moved and the DF opened. They ran a reasonable service all through lunch whilst both fasts were blocked. A cover for further driver shortages?