diff --git a/B08_Quantity/B08_Quantity_Haul.py b/B08_Quantity/B08_Quantity_Haul.py
index b8ccc551f..93a01af50 100644
--- a/B08_Quantity/B08_Quantity_Haul.py
+++ b/B08_Quantity/B08_Quantity_Haul.py
@@ -101,3 +101,29 @@ def haul_groups(materials: dict[str, Any] | None) -> list[dict[str, Any]]:
             name, unit = NAMES[gkey]
             out[gkey] = {"key": gkey, "name": name, "unit": unit, "qty": None}
     return list(out.values())
+
+
+def with_haul_routes(data: dict[str, Any], groups: list[dict[str, Any]]) -> dict[str, Any]:
+    """거리이정표 자료에 운반 행 상자 자동(251-2) — 묶음마다 거래처 상자가 없으면 넣음.
+
+    거래처 · 주소 빈칸 · 선 없음(linked false) · 항목 = 자재 이름 ·
+    저장은 [저장] 때(읽기만 합침)."""
+    have = {r.get("haul") for r in data.get("routes") or []}
+    routes = list(data.get("routes") or [])
+    for g in groups:
+        if g["key"] in have:
+            continue
+        routes.append(
+            {
+                "id": f"h-{g['key']}"[:40],
+                "name": "",
+                "address": "",
+                "via_base": True,
+                "linked": False,
+                "dir": None,
+                "haul": g["key"],
+                "legs": [{"road": None, "km": None}],
+                "rows": [{"item": g["name"], "dest": "start", "note": ""}],
+            }
+        )
+    return {**data, "routes": routes}
diff --git a/B08_Quantity/B08_Quantity_Milestone_Calc.ts b/B08_Quantity/B08_Quantity_Milestone_Calc.ts
index 8637bc66e..5c1bac853 100644
--- a/B08_Quantity/B08_Quantity_Milestone_Calc.ts
+++ b/B08_Quantity/B08_Quantity_Milestone_Calc.ts
@@ -87,6 +87,10 @@ export interface MilestoneRoute {
   linked?: boolean;
   /** 수기 입력(155) — 카카오 길찾기 안 함 · km 손 입력만 */
   manual?: boolean;
+  /** 운반 묶음 키(251 · 총괄자재 · B09 운반 줄과 이음) — 없음 = 사용자 [요소 추가] 상자 */
+  haul?: string | null;
+  /** 단가연결(251 · dg · sg · logic 꼴 · 정본) */
+  ref?: Record<string, unknown> | null;
   /** 업체 → 기준점(거침) · 시점 구간 */
   legs: Leg[];
   rows: MilestoneRow[];
diff --git a/B08_Quantity/B08_Quantity_Router_Milestone.py b/B08_Quantity/B08_Quantity_Router_Milestone.py
index 8e20c819c..e68cccdbc 100644
--- a/B08_Quantity/B08_Quantity_Router_Milestone.py
+++ b/B08_Quantity/B08_Quantity_Router_Milestone.py
@@ -49,9 +49,11 @@ from pydantic import BaseModel, Field, ValidationError, model_validator
 from B01_Dashboard.B01_Dashboard_Map import reverse_geocode
 from B02_ProjRegister.B02_ProjRegister_Repository import get_project_by_id
 from B03_FileInput.B03_FileInput_Engine import save_upload_stream
+from B08_Quantity.B08_Quantity_Haul import haul_groups, with_haul_routes
 from B08_Quantity.B08_Quantity_Milestone_Calc import compute_milestone, r3
 from B08_Quantity.B08_Quantity_Milestone_Capture import make_route_image
 from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
+from B08_Quantity.B08_Quantity_Router_Material import material_sheets
 from common_util.common_util_initial_snapshot import design_route_csv_path
 from common_util.common_util_json import atomic_write_json
 from common_util.common_util_route_geometry import (
@@ -101,6 +103,9 @@ class Place(BaseModel):
 class Route(Place):
     id: str = Field(pattern=ROUTE_ID)
     via_base: bool = True
+    # 251 운반 묶음 키(총괄자재 · B09 운반 줄과 이음) · 단가연결(dg · sg · logic 꼴 · 정본)
+    haul: str | None = Field(default=None, max_length=60, pattern=r"^[A-Za-z0-9_-]+$")
+    ref: dict[str, Any] | None = None
     linked: bool = True  # 155 False = 아직 선 안 이음(요소 추가 뒤)
     rows: list[Row] = Field(default_factory=list, max_length=50)
 
@@ -239,10 +244,19 @@ def _route_id(route: str) -> str:
         raise HTTPException(status_code=400, detail="경로 id 가 바르지 않습니다.") from error
 
 
+async def _haul(project_id: UUID) -> list[dict[str, Any]]:
+    """운반 묶음(251) — 자재 집계 못 읽으면 빈 목록(거리이정표는 그대로)."""
+    try:
+        return haul_groups(await material_sheets(project_id))
+    except Exception:  # noqa: BLE001 — 자재 집계 없음 · 실패 = 자동 상자 없음
+        return []
+
+
 @router.get(PATH)
 async def milestone_read(project_id: UUID) -> dict[str, Any]:
     root = await _project_root(project_id)
-    return await asyncio.to_thread(lambda: payload(root, read_data(root)))
+    groups = await _haul(project_id)
+    return await asyncio.to_thread(lambda: payload(root, with_haul_routes(read_data(root), groups)))
 
 
 @router.put(PATH)
diff --git a/resources/tester/test_251_1_haul_groups.py b/resources/tester/test_251_1_haul_groups.py
index 127f09d49..76d258c26 100644
--- a/resources/tester/test_251_1_haul_groups.py
+++ b/resources/tester/test_251_1_haul_groups.py
@@ -48,3 +48,31 @@ def test_B09_운반_줄_옛_키_그대로_새_묶음_키():
     assert items["haul:remicon"]["name"] == "레미콘운반" and items["haul:remicon"]["unit"] == "㎥"
     assert all(i["section"] == "3" for i in items.values())
     assert {"haul:1", "haul:2", "haul:3", "haul:4", "haul:5", "haul:6"} <= set(items)
+
+
+def test_251_2_거리이정표_운반_상자_자동():
+    from B08_Quantity.B08_Quantity_Haul import with_haul_routes
+
+    groups = haul_groups(_mats(ROWS))
+    data = {"site": {}, "base": {"enabled": False}, "routes": [
+        {"id": "h-sand", "name": "골재상", "haul": "sand", "rows": [{"item": "모래"}]},
+        {"id": "u1", "name": "내 상자", "rows": []},
+    ]}  # fmt: skip
+    out = with_haul_routes(data, groups)
+    by = {r["id"]: r for r in out["routes"]}
+    assert by["h-sand"]["name"] == "골재상"  # 있는 상자 그대로
+    assert "u1" in by  # 사용자 상자 그대로
+    new = by["h-remicon"]
+    assert (new["name"], new["address"], new["linked"], new["haul"]) == ("", "", False, "remicon")
+    assert new["rows"] == [{"item": "레미콘", "dest": "start", "note": ""}]
+    assert len([r for r in out["routes"] if r.get("haul")]) == len(groups)
+    assert data["routes"][0] is out["routes"][0] and len(data["routes"]) == 2  # 원본 안 바뀜
+
+
+def test_251_2_서버_모델_읽기_길():
+    from B08_Quantity.B08_Quantity_Router_Milestone import Route
+
+    r = Route(id="h-sand", haul="sand", ref={"tab": "logic", "code": "GF000284"})
+    assert r.haul == "sand" and r.ref == {"tab": "logic", "code": "GF000284"}
+    src = (ROOT / "B08_Quantity" / "B08_Quantity_Router_Milestone.py").read_text(encoding="utf-8")
+    assert "with_haul_routes(read_data(root), groups)" in src