It appears that the special 313 final service on the North London Line has now been cancelled. This is because there will no longer be a 313 unit available to run the service.On a more positive note, it appears that four-car 378s will likely begin to make an appearance on the NLL from next week onwards. Sources indicate that two sets will probably enter service on Tuesday, with more to follow as the arrive from Derby.Finally, for those whose memories stretch even further back than the 313s, Greg Tingey kindly sent us a photo of a 4-SUB unit and a BR 1950's slam-door set at Broad Street.