Today, Shenfield is served by fast trains on the main line towards London and it is also the eastern terminus of the stopping "metro" service from Liverpool Street. In the future Shenfield will additionally be one of two eastern termini of Crossrail (to be branded as the Elizabeth line), although the precursor company TfL Rail took over the existing "metro" service in May 2015. Nine-carriage trains will run over the pair of 'electric lines', rather than the main lines, replacing the existing eight-carriage "metro" trains and allowing Crossrail to serve all stations between Shenfield and Liverpool Street, continuing west to when the line opens fully. At peak hours the frequency of service will increase from eight trains per hour to 12, necessitating the construction of a new 210-metre