Kirklees Council has appointed the consultancy firm to make the case for enhancing the Penistone Line between Huddersfield and Sheffield. An outline business case to improve a Yorkshire railway is to be developed by SLC. An outline business case to improve a Yorkshire railway is to be developed by SLC. Kirklees Council has appointed the consultancy firm to make the case for enhancing the Penistone Line between Huddersfield and Sheffield. Moses Crook, Deputy Leader and Cabinet Member for Transport and Housing at Kirklees Council, said the improvements will bring “more reliable trains with better journey times”.