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In page AEC Routemaster:

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Most of the ex-Country RMLs that were sold back to LT in the late 1970s served longer with red livery than with their original green[citation needed] (Most did 14 years as green buses but over 20 as red buses). Some RCLs had the platform doors removed and entered service as red buses. RMC4 (ex CRL4) was kept by London Country but was later sold when the NBC was sold off.