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 approximately every 10 minutes to either the East or West coast. Dewsbury will be one of the best connected towns in the country.