Progress So Far September 2025 The firebox, boiler barrel and dome are now united. May 2025 3D images of locomotive assembly. April 2025 Drilling of holes for boiler tubes. Assembly of inner and outer firebox, prior to attachment of 400 firebox stays. March 2025 Machining of boiler dome and boiler tubes ready for assembly. February 2025 Welding of the inner and outer firebox. January 2025  Trial assembly of boiler and firebox. December 2024 Arrival of the shaped components for the boiler and firebox.