Services from Charing Cross and Waterloo East will be disrupted for 22 days in July and August, with services diverted to other stations in the capital.
Network Rail is warning Greater Anglia passengers that they face disruption next month as it replaces rails and sleepers between Battlesbridge and Southminster that are more than five decades old.
A 4,000 tonne bridge across the M42 near the Interchange Station construction site at Solihull has been demolished as part of the construction of HS2.