1,400 metres of overhead wires and around 1.5km of track will be replaced during the work, which takes place between the 17th and 23rd of February.
Metro services are expected to resume on the 24th February.
Buses (Service 901) will replace trains to help passengers get to their destination
Work on the Metro system began in 2010 and has since seen £446m of Government funding spent to improve the network for passengers.
Stuart Clarke, Metro Infrastructure Director, said: “This major line closure is part of our ongoing multi-million pound investment in Metro modernisation to ensure that the network is here for many decades to come. These works will involve the renewal of 1,400 metres of overhead lines and a 1.5 kilometre section of track. We are also carrying out a range of other secondary works which includes lineside estate management.”
“While there is no good time to close a large section of the Metro system, the works will improve Metro's resilience in the future. We will do all we can to keep any disturbance to an absolute minimum, and I apologise in advance for the inconvenience this will cause. Customers will be provided with frequent replacement bus services throughout this work.”