Signed off is not the same as built to plan

Anyone who has drawn up as-builts knows this. A signed checklist only checks what has a box on it. The deviations that matter sit in records marked OK, and you find them by reading every one against the plans once the crew has gone.

One case on our Try page: QC records for a signal cable trough against the current plans. Yesper redlined only what deviates: 23 items, 12 of them signed off as passing, including an under-track crossing that landed inside a siding switch. Some foundations match the previous revision, and the checklist header says so.

What hides under a passing sign-off turns up in the redlines, and the engineer of record sees the crossing before the record drawings are issued, not after. Same for its neighbours on the Try page: drawing revisions side by side, a coordinate check on catenary foundations, cable tags against the schedule.

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