Cogitamus - Chiltern Railwaysmp;#39; Marylebone Aylesbury service is unique as part of the route, between Harrow and Amersham, operates over London Underground infrastructure. At the start of November, both RMT and ASLEF called strikes which would have effectively shut down the Underground network. The ASLEF strikes would not have directly impacted Chiltern but the RMT strikes included signallers so that the LUL section of the route would have been shut. Chiltern therefore publicised that it would only be able to operate a very limited Aylesbury .Great Missenden shuttle servicemp;#39; effectively useless for the great majority of its passengers.
