Rail services at Hertford East will be suspended for 17 days in August as Greater Anglia extend the platforms to allow use of longer 10-carriage trains.
Weekend services at the station will also be hit in July and early August.
Platforms at Hertford East, Ware, Broxbourne and Stratford stations need to be lengthened in the final stage of Greater Anglia's programme to replace every single train on the network with brand-new state-of-the-art trains.
The 17-day-stretch of continuous engineering works on the Hertford East Line will last from Saturday 13th to Monday 29th August.
Greater Anglia will run a rail replacement bus service and Greater Anglia tickets will also be accepted on Great Northern trains from Hertford North to London Kings Cross.
Work is due to take place on the following dates:
Andrew Goodrum, Greater Anglia's client and programme director, said: "We're very sorry for any inconvenience this work causes our customers, but it's essential so that we can run our new longer trains on this busy commuter route.
"We will make sure that all customers can complete their journeys with our fully accessible rail replacement buses. We'll have extra staff on hand to make the transition between train and bus as easy as possible.
"Customer reaction to our new trains has been fantastic. With their plug and USB points, fast free wifi, air conditioning, improved accessibility features, dedicated cycle spaces and better passenger information screens, our new trains offer a much better travel experience."
The branch line was also closed in April for 8 days for platform extention works.
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