The work began on Monday, October 21.
Midweek works will continue until Friday, November 22.
Chris Nutton, major projects and TRU director at TransPennine Express, said: “In the remaining two weeks of these works, TransPennine Express won’t be able to run trains on the line through Dewsbury and Morley.
“To provide as many customer journeys on trains as possible, we will divert trains between Huddersfield and Leeds via Wakefield Kirkgate, increasing journey times.
“Rail replacement services will connect Huddersfield, Dewsbury, Leeds, and all local stations in between.”
Diversionary routes and rail replacement bus services have been in place from Mondays to Fridays during the works period so far.
Sixty-seven overhead line equipment (OLE) foundations are said to have been installed, with OLE mast installation to follow.
Other mentioned upgrades include 1662m of track renewals, 250m of drainage work, and 900m of cabling removed.
Customers can obtain travel updates at nationalrail.co.uk