# Grand Escape unified hall and R4 passenger line — implementation

Status: **built live, bidirectionally cart-verified, saved, and exact-verified across a full Paper restart on 2026-08-27.**

The two separated Grand Escape stadium chambers are now one continuous room from `x3464..3727, y2..26, z1144..1231`. Both internal divider walls are gone, the rebuilt station opens directly into the hall, and a continuous Y26 canopy with full-span ribs provides the requested stadium roof without interior columns. Both exact owner houses, their signs, basement studios, surface stairs, and four door routes remain protected.

R4 starts at Grand Central Platform 4 at `y12,z824`, follows a fully generated contained alignment on `z904`, and enters the rebuilt Grand Escape terminus at `(3598,3,1132)`. The complete route contains **3,871 rail positions / 3,870 edges**. Every straight rail has direct embedded power, the seven-wide bore has a 12-block visible-light rhythm, and the line does not touch dSmith, R1, R2, R3, the Spine, the Castle, IowaViking, or Mountain Side Estate.

The three recovery-backed successor operations contain **326,850 records** and compose to **315,268 unique changed coordinates**. The broader design covers **362,147 coordinates**, including already-correct coordinates that required no mutation record. The authoritative hash-bound index is `fixtures/grand-escape-unified-hall-r4-operation-index-20260827.json`.

The isolated clone proof applied all three operations, restarted Paper, checked the complete final state, physically covered every rail in both directions, preserved both houses and independent rail/property controls, reversed all operations exactly, and passed a second restart. Live acceptance then repeated the exact chain and functional checks, physically covered **7,742 directional rail positions**, removed every temporary cart and forceload, restarted Paper, and passed again with zero mismatch, fluid, or fire defects.

Safe arrivals:

- Grand Escape unified hall / concourse: `/tp @s 3590.5 4 1132.5`
- Grand Escape R4 platform: `/tp @s 3597.5 4 1132.5`
- IANLAN Grand Central upper concourse: `/tp @s 105.5 22 828.5`
- Grand Central R4 / T-GEE track: `/tp @s 40.5 13 824.5`

Evidence:

- clone: `fixtures/grand-escape-unified-hall-r4-clone-roundtrip-20260827.json`
- live/restart: `fixtures/grand-escape-unified-hall-r4-live-verification-20260827.json`
- authorization: `fixtures/grand-escape-unified-hall-r4-live-authorization-20260827.json`
- plan maps: `reports/maps/grand-escape-unified-hall-r4/`