were wholly owned by two or more other companies. If not all of the owning companies went into the same group then the joint company could not be grouped. Joint lines did not always operate any services: they owned the track, stations etc. and the services were operated by one or more of the parent companies: These are those in which the group companies only are concerned: Cheshire Lines Committee: (GNR, Midland and GCR); now operated under direction of a board of directors appointed by LNER (two-thirds) and LMS (one-third). Length . Rolling stock owned by CLC; locomotive power by LNER. Great Western and Great Central Joint Railway: GWR and GCR; subsequent to the grouping the parent companies were the GWR and the LNER, but the title was not altered. Manchester, South Junction and Altrincham Railway: LNWR and GCR; subsequent to the grouping the parent companies were the LMS and the LNER. Midland and Great Northern Joint Railway: (Midland and GNR; subsequent to the grouping the parent companies were the LMS and the LNER). Length . This was the largest joint system in the UK, and many of the services were operated by the joint company itself. In addition, it received substantial traffic from the GNR and MR/LMS, but rather less post-grouping from the LNER (which also owned the competing ex-GER system in East Anglia). Somerset and Dorset Joint Railway: (Midland and LSWR). Length . Joint lines where one or more partners were ungrouped: Aylesbury Station: joint between the GW & GC Joint and the Metropolitan and Great Central Joint Committee East London Railway: prior to grouping, this railway was owned one-sixth each by the Great Eastern Railway, London, Brighton and South Coast Railway, Metropolitan Railway, District Railway; and one-third by the South Eastern and Chatham Railway (as successors to the London, Chatham and Dover Railway and South Eastern Railway, who had owned one-sixth each). After grouping, it was owned half by the Southern, and one-sixth each by the LNER, Metropolitan and District. Length . Managed and operated by Met; goods traffic by LNER. Metropolitan and Great Central Joint Committee: prior to grouping, owned by the Metropolitan Railway and GCR; post-Grouping, Metropolitan and LNER. Railways not included in group companies Electric or electric and steam lines Railways associated with the Underground Electric Railways Company of London: Central London Railway: . Trains worked through to Ealing over the Ealing and Shepherd's