On 31st May 2015, the Romford to Upminster line were transferred to TFL's London Overground from Abellio Greater Anglia.
The service uses British Rail Class 317. Inside they feature a table which is unusual for a Commuter railway train to have. So I felt the service is first class because of the features which London Overground provided for the Romford to Upminster Line.
Below I have filmed the service from Romford to Emerson Park.
Transport for London London Overground
Romford to Upminster branch
Operated by LOROL (Arriva/MTR) under contract to TfL
From Romford to Emerson Park
British Rail Class 317
Filmed on 2nd June 2015
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Video: Abellio Greater Anglia service from Ilford to Stratford