Series 2 OLE: three things that only make sense after your first possession.
Series 2 OLE is the system most new UK mainline electrification is now designed around. On paper it is faster, lighter and more maintainable. On the rail head, it still rewards engineers who have spent a possession inside one.
1. Registration geometry is not a drawing exercise.
Cant, stagger, sway and all the quiet numbers that sit in the design notes get loud when you meet a real cutting with real vegetation and a real possession clock. Carry a tape, not just the drawing.
2. Wiring train logistics drive the programme more than the design does.
The train you get, the turnround between possessions, and the overhead clearance of the route access point shape what actually happens between 22:00 and 06:00. Book the train before you book the crew.
3. Commissioning starts at piling, not at energisation.
The site records your commissioning engineer will need on the last possession are recorded in the first week of the civils programme. Pile-proofs, foundation CP records, troughing as-installed: these are commissioning evidence. Capture them as evidence, not as paperwork.