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OPTION W8: |
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| Description | Double deck entire two track section. |
| Pros | Meets the expected capacity requirements, Speed increase buy making tunnel bore same one way with no aerodynamic constraint on upper level when opened out. |
| Cons | Visually awkward to Digswell valley, Difficult construction, which will cause major disruption during construction, "Opening out" (as option W2) required for high level tracks, Major environmental disturbance, High cost. |
| Summary | Costly and very disruptive. |