The Transpennine Route Upgrade (TRU) is one of the largest construction projects in Europe. Dewsbury is in the midst of the Huddersfield - Leeds section and you can find all the details on their website at https://thetrupgrade.co.uk/.
When complete it will be possible to catch a train to either the East or West coast approximately every 10 minutes making Dewsbury one of the best connected towns in the country.