Track, structures and possessions on one record from survey to handback. The corridor is captured between services, the as-built is registered against the alignment before breakfast, and the handback pack is written by the work rather than after it.
Capture · Mission 05
The sheet above is a drawing of this. 9 capture waypoints, and every finding called as the aircraft reaches it — scroll sets the target, the mission keeps its own pace, and the page waits for it.
Sector · Railways
Blocked at 22:15, handed back at 06:00. Down the six-foot at three and a half metres under the wire, under the station footbridge with the test unit alongside, along the platforms and into the stabling yard — then the unit walks between two rakes and reads every clamp lock on the joint. The pack is written by the work instead of remembered after it.
A possession is eight hours long and costs more than the work inside it. Half of what gets planned into it is capture: somebody has to walk the cess, somebody has to fly the cutting, and both need the line dead.
Missions are scheduled against the block itself — docked flights launch on release, ground rounds queue behind them, and every task carries its own clock, so the pack shows what fitted and what slid before anyone stands on ballast.
Track geometry, structure clearances and drainage all get measured, and all three land in different files. The question the engineer actually asks — does the corridor match the alignment at CH 118+400 — takes a week to answer.
The corridor comes back as a surface and a cloud on the project's coordinate system. Section it anywhere, difference it against the design alignment, read cant, clearance and formation level off the same model, ±6 mm against control.
Handback is 06:00 and the pack is due at 06:00. Whatever the night shift did not write down at the time gets reconstructed from memory in a cabin at half past five.
Every capture, checkpoint and closed task on the possession lands in the day's log as it happens, timestamped and located by chainage, so the pack that goes to the controller is assembled rather than remembered.
210 km
Corridor held on one record, survey through to handback
41
Possessions planned, worked and packed on the same rail
±6 mm
As-built against design alignment, worst case at control
The program runs on the possession's clock — blocked at 22:15, handed back at 06:00. What needs the line dead flies inside the block; everything else is captured with the railway open.
On the block, launched the minute the line is released
The dock launches on release — seven minutes from block to airborne — and flies the formation while the crews are still walking in. The night's work starts on a measured corridor, not a remembered one.
BLOCK 22:15 · AWAY 22:22Between services, offset from the running line
Three passes along the open corridor return track, structures and earthworks without a block. The as-built sections against the design alignment at ±6 mm at control — cant, clearance and formation off one model.
PASSES 3 · 1.2CMCutting by cutting, on the drainage walk
The slip face in cutting 6 is walked and scanned at the same stations each round, so 40 mm of movement since week 30 is a number on the record — and the drainage run is re-staked off the cloud, not the drawing.
CUTTING 6 · SLIP +40MM SINCE WK-30Inside the block, while the line is dead
The underbridge is orbited in the hours that actually need the track — deck, bearings and piers landing on the same record as the alignment, so the block buys only what daylight cannot.
B-241 · SPANS 4×49MYou do — the missions queue against the block itself. The dock launches on release, seven minutes after the 22:15 block, ground rounds follow, and every task carries its own clock so the pack shows what fitted and what slid.
BLOCK 22:15 · AWAY 22:22Handback, on time. Every capture, checkpoint and closed task lands in the log as it happens, timestamped and located by chainage — 41 tasks closed on P-41, and the pack the controller gets is assembled, not remembered.
HANDBACK 06:00 · TASKS 41 · ON TIMENot for most of it. Three passes along the open corridor return the record at 1.2 cm between services; the block is kept for what genuinely needs the track — the orbit under B-241, the crossover, the cess.
PASSES 3 · 1.2CM · LINE OPENSection the corridor anywhere and read cant, clearance and formation level off the same model — ±6 mm against control at CH 118+400, checked after every capture, so the question takes minutes instead of a week.
AS-BUILT ±6MM · CH 118+400Yes — movement is differenced, not noticed. The slip face in cutting 6 has moved 40 mm since week 30, read at the same stations every round, and the trend arrives before the emergency speed restriction does.
CUTTING 6 · +40MM · SINCE WK-30One. 210 km and 41 possessions on the same record — the engineer sectioning CH 118+400 and the controller reading the handback pack are looking at the same corridor, cut to their own morning.
CORRIDOR 210KM · POSSESSIONS 41 · ONE RECORDRead overnight on a corridor like this one: the possession plan, the night's dock flights, the corridor scan and the alignment at its current revision. Three of the 27 profiles wake up to it.
21:40 · P-41 · ACCESS POINT
SEQUENCE
P-41 blocks at 22:15 — the dock is released first and away by 22:22, the orbit under B-241 follows, and the pack builds as tasks close, so 06:00 is a handback rather than a scramble.
CITES: POSSESSION PLAN P-41 · MISSION QUEUE · BLOCK 22:15
07:30 · CH 118+400 · ALIGNMENT
AS-BUILT
The night's capture sections against the design alignment — ±6 mm at control at CH 118+400 — and cutting 6's slip face carries 40 mm of movement since week 30, flagged on the register.
CITES: SCAN P-41 · ALIGNMENT REV · CUTTING 6 DIFF
05:55 · P-41 · HANDBACK
HAZARD
Nobody walks the cess at five to six to prove the line is clear — handback reads off the record: 41 tasks closed, plant clear on the final pass, and the controller gets evidence, not assurances.
CITES: POSSESSION PACK · TASKS 41 · FINAL PASS
One calendar for every autonomous capture on the portfolio
MISSIONS ON A CYCLEThe site in three dimensions, measurable by anyone who opens it
MESH 40M FACES · DEM 5CMLogs drafted from capture; the super edits, doesn't type
DRAFTED 06:00Scheduled flights from a rooftop box; nobody drives to site
2×/DAY · 0 PILOTSWeekly floor walks auto-pinned to drawings
8 FLOORS/HR · AUTO-PINNEDFigures are a specimen record, drawn to the platform's own conventions.
Tell us the block time and the chainage — we will plan the night's captures into it and hand you the possession pack at 06:00.