Romford railway station
It is also the northern terminus of a branch line to Upminster operated by London Overground . 
<triplet> a branch line <subj> London Overground <obj> part of <triplet> Upminster <subj> a branch line <obj> connecting line <subj> London Overground <obj> connecting service <triplet> London Overground <subj> a branch line <obj> has part