This volume of High Speed Two: Infrastructure Design and Construction from the HS2 Project, contains a collection of papers submitted to HS2 Ltd's Technical Papers Competition. Contributions have come from consultants, contractors, suppliers and third-party stakeholders involved in developing the planned infrastructure of the HS2 project. As part of HS2's Learning Legacy commitment, the organisation seeks to share its learnings and best practices with the rest of the industry throughout the project lifecycle. Papers in this second volume cover digital engineering, environment and heritage