 The western bore, also a single track, was opened in 1876 and is also the narrowest.The northern end is finished with a brick castellated retaining wall with the three horseshoe arches and is a grade II listed building with the note that it is "an interesting example of early railway architecture".The eastern bore and the eastern side of the central bore are used by goods traffic and West Midlands Trains services to and from London Euston respectively to mainly local stations including traffic using the Northampton Loop Line connecting to and from Birmingham, Rugby, and some stations further north.The current maximum speed on these lines between Euston and Northampton for passenger traffic is .