London Overground Rail Operations
London Overground Rail Operations Limited was a train operating company contracted to operate the London Overground train service on the National Rail network , under the franchise control of Transport for London . 
<triplet> London Overground Rail Operations <subj> train operating company <obj> instance of <triplet> London Overground <subj> London Overground Rail Operations <obj> operator <subj> Transport for London <obj> owned by <triplet> Transport for London <subj> London Overground <obj> owner of