- The active static parser head is now the `engine_types` semantics frontier.
The repo now has structural inspectors for `.car`, `.lco`, `.cgo`, and `.cct`, but the binary side is still only partially semantic: the checked 1.05 corpus grounds `.car` fixed strings at `0x0c / 0x48 / 0x84` plus a second fixed stem slot at `0xa2` and a side-view resource name at `0xc0`, while `.lco` carries a stable primary stem at `0x04` and only conditional companion/body slots at `0x0c` and `0x12` when the leading stem slot is padded.
The checked 1.05 corpus now also splits `.car` auxiliary stems into `126` direct matches, `14` role-neutral roots, and only `5` truly distinct cases, with those five exact internal-to-auxiliary pairs now preserved directly in the report surface.
That distinct cohort is narrower than it first looked: `3` of the `5` are just opposite-role tender-to-loco pairings (`ClassA1T -> ClassA1L`, `CramptonT -> CramptonL`, `WhaleT -> WhaleL`), and only the two `QJ` rows remain as reordered alias roots.
On the cargo side, `.cgo` now collapses into five stable scalar ladders instead of arbitrary floats.
The early `.lco` lane block is now partially partitioned too: only offsets `0x20`, `0x34`, `0x38`, `0x3c`, `0x44`, `0x48`, and `0x54` behave like low-cardinality buckets, while the other early lanes still look high-variance.
The side-view resource path is now grounded into `Data/2D/rt3_2IMB.PK4`, and the `.imb` parser now decodes shipped comment-suffixed numeric rows plus `_NE` profile fields such as `HorizontalScaleModifier` and `ImageWHScaled`.
The checked PK4 linkage split is now explicit too: `132 / 145` side-view resource names resolve directly in 1.05, but the remaining `13` are the missing `CarSideView_3.imb` cohort and that hole exists in both checked installs, while `43 / 145` derived `{internal_stem}_NE.imb` names resolve and all of those hits belong to matched locomotive pairs.
The parser now preserves that `CarSideView_3` miss cohort exactly, and it also preserves the tiny conditional `.lco` companion-profile seam directly: in 1.05 the padded `.lco` companion/body slots collapse to `Zephyr / (none) / CarSideView_3` for `242_a1_l`, `gp35l`, `u1l`, and `zephyrl`, and to `VL80T / Loco / CarSideView_{1,2}` for `be 5-7`, `f3 loco`, and `gp7`.
The classic install widens the same `0xc0` seam further: the side-view slot is not only `CarSideView_*` but also a larger unresolved `*_Profile.imb` family, and every checked classic `*_Profile.imb` reference currently misses the packaged `rt3_2IMB.PK4` surface too.
A whole-tree file census now rules out the simple fallback too: none of those `*_Profile.imb` names, and no `CarSideView_3.imb`, exist as loose files anywhere in the checked `rt3/` or `rt3_105/` trees.
The packaged profile metadata is stable enough to summarize: `CarSideView_1` is `512x512` at `0.04` VRAM, `CarSideView_2` is `512x256` at `0.02`, and every packaged `_NE` profile is `512x128` with `HorizontalScaleModifier = 0.75` and `MaxPercentOfInterfaceVRAM = 0.09`.
The `_NE` split is now aligned with the locomotive display census too: all `43` packaged `_NE` hits live inside the grounded display prefix, and all `5` unmatched display-tail families are still missing packaged `_NE` profiles.
The cargo side is partially linked now as well: the `.cgo` ladder families and `.cct` sidecar identifiers share the same cargo-family keys for ten checked families, with `Troop` left as the only `.cct`-only outlier.
The next honest static work is to decide whether the two remaining reordered `QJ` auxiliary roots are just alternate content aliases or evidence of a narrower foreign-display/image root, decide whether the classic `*_Profile.imb` side-view references are dead loose-file dependencies or a still-unmapped package family, and decide how far the `.cgo` ladders plus the low-cardinality `.lco` lanes can be grounded without overclaiming semantics. The latest corpus check did narrow one point already: the low-cardinality `.lco` lanes do not split cleanly on `_NE` presence, so that branch now wants binary/code correlation rather than more aggregate-only counting.
Preserved checked format inventory detail now lives in [RT3 format inventory](rehost-queue/format-inventory-2026-04-21.md).
## Preserved External And Dynamic Blockers
- The locomotives-page tail remains preserved as an external-corpus blocker.
Static repo-local work on this head is now exhausted: the local `29`-save `.gms + .gmx` census proves the stable prefix through `58`, proves the same two scenario-dependent `59+` tail families, and still finds no `Class QJ` placement plus no descriptor carriers in `452` or `457..502`. The next honest non-hook step requires a broader save corpus; the next non-static step requires dynamic tracing.
Preserved checked blocker detail now lives in [Locomotive descriptor tails](rehost-queue/locomotive-descriptor-tails-2026-04-21.md).
- The periodic-company control-lane head remains preserved as a dynamic blocker around the ordinary loaded runtime-effect strip `0x00444d92 -> 0x00432f40(kind 8) -> 0x004323a0 -> 0x00431b20`.
Static progress on this head now appears genuinely blocked: the whole-binary `[...+0x7ef]` reference census still collapses to the grounded writer set plus the already-known compare and copy helpers, so the next honest step likely requires hook-side or runtime tracing between reload `0x00433130` and the world-entry kind-`8` sweep at `0x00444d92`.
- The Tier-2 building head remains preserved as a dynamic blocker around the seed/projection seam into `0x00412d70`.
The stock decode chain, the bare-name remap callback, the rebank-or-clone owner, and the earlier suspected mid-range replay strip are all now grounded, so the next honest step likely requires runtime tracing of which source rows actually enter the live bank-qualified seed set.
