5 april 2009 - Cobham (UK). A green country area RF. These buses also operated the Green Line express network across London for many years, but many were later downgraded to normal bus work and lost their distinctive Green Line livery.Cobham (UK). A green country area RF. These buses also operated the Green Line express network across London for many years, but many were later downgraded to normal bus work and lost their distinctive Green Line livery. Author: dvigar