diff --git a/B05_Profile/B05_Profile_Route_Save.py b/B05_Profile/B05_Profile_Route_Save.py
index 388f627ff..6ab2390c9 100644
--- a/B05_Profile/B05_Profile_Route_Save.py
+++ b/B05_Profile/B05_Profile_Route_Save.py
@@ -53,6 +53,7 @@ from B05_Profile.B05_Profile_Route_Save_Parts import (
     follow_pipes,
     route_moved_stations,
     seat_route_moved,
+    keyed_stations,
     station_keys,
     station_seats,
     vertices_of,
@@ -331,8 +332,11 @@ async def _carry_cross(
 
     new_long = _read_json(project_root / relative)
     _, new_structures = load_structures(str(project_root))
-    old_keys = station_keys(old_long.get("stations") or [], old_pipes, old_structures, interval_m)
-    new_keys = station_keys(
+    # 열쇠 = Node 측점 출력(`key` · 511-B B-2) · 없으면(옛 파일 · DTM 아닌 지표면) 파이썬 열쇠
+    old_keys = keyed_stations(old_long.get("stations") or []) or station_keys(
+        old_long.get("stations") or [], old_pipes, old_structures, interval_m
+    )
+    new_keys = keyed_stations(new_long.get("stations") or []) or station_keys(
         new_long.get("stations") or [], [pipe for _, pipe in pairs], new_structures, interval_m
     )
     designs = {
diff --git a/B05_Profile/B05_Profile_Route_Save_Parts.py b/B05_Profile/B05_Profile_Route_Save_Parts.py
index eee34ca91..990222a25 100644
--- a/B05_Profile/B05_Profile_Route_Save_Parts.py
+++ b/B05_Profile/B05_Profile_Route_Save_Parts.py
@@ -10,7 +10,8 @@ DB · 파일 없이 값만 받아 값을 돌려준다(시험이 그대로 부름
     같은 세류선 라벨 관(옮겼어도) · 지움 표지가 짝으로 잡은 교차점엔 안 더함(507-2 ·
     `common_util_stream_crossing`).
   - 관 최대 간격 보충 없음(369) — 간격 보충은 배수유역 [자동 제안]만.
-  - 측점 열쇠 = `common_util_station_key.station_key` 한 벌(sub2 짝) — 일반 `grid:k` ·
+  - 측점 열쇠 = Node 측점 생성이 측점에 적은 `key`(511-B B-2 · `keyed_stations`) · 없으면(옛 파일 ·
+    DTM 아닌 지표면) `common_util_station_key.station_key` 한 벌(sub2 짝) — 일반 `grid:k` ·
     관 `pipe:<id>` · 구조물 `structure:<id>` · 시종점 `end:BP` · `end:EP` ·
     id 없으면 `at:<누가거리 0.01 m>`.
   - 횡단 이월 = 같은 열쇠 측점에 `CARRY_INPUT_KEYS` 일곱 + `ROUTE_CARRY_KEYS`(사면 쉬프트 ·
@@ -176,6 +177,18 @@ def station_keys(
     return out
 
 
+def keyed_stations(stations: Sequence[dict[str, Any]]) -> dict[str, float] | None:
+    """측점이 지닌 열쇠(`key` · Node 측점 생성 출력 · 511-B B-2) → 누가거리 · 열쇠 없는 측점이 있으면
+    None(옛 파일 · DTM 아닌 지표면 = `station_keys` 로 셈)."""
+    rows = [row for row in stations if row.get("chainage_m") is not None]
+    if not rows or not all(isinstance(row.get("key"), str) for row in rows):
+        return None
+    out: dict[str, float] = {}
+    for row in rows:
+        out.setdefault(row["key"], float(row["chainage_m"]))
+    return out
+
+
 def station_seats(
     stations: Sequence[dict[str, Any]], keys: dict[str, float]
 ) -> dict[str, tuple[float, float, tuple[float, float] | None] | None]:
diff --git a/resources/tester/helper_472_1_paths.py b/resources/tester/helper_472_1_paths.py
index 9540479a3..d4fd974c8 100644
--- a/resources/tester/helper_472_1_paths.py
+++ b/resources/tester/helper_472_1_paths.py
@@ -97,7 +97,7 @@ def values_of(
 
 def _keys(longitudinal: dict[str, Any], sections: list[dict[str, Any]], root: Path) -> list:
     """서버 측점 열쇠(`station_keys` · 노선 저장 이월이 쓰는 한 벌) — 상세 측점 차례."""
-    from B05_Profile.B05_Profile_Route_Save_Parts import station_keys
+    from B05_Profile.B05_Profile_Route_Save_Parts import keyed_stations, station_keys
     from B05_Profile.B05_Profile_Structures_Repository import load_structures
     from common_util.common_util_drainage_pipes import pipe_points_path_in, read_pipe_points_file
 
@@ -107,7 +107,9 @@ def _keys(longitudinal: dict[str, Any], sections: list[dict[str, Any]], root: Pa
         (longitudinal.get("profile_alignment") or {}).get("policy", {}).get("station_interval_m")
         or 20.0
     )
-    found = station_keys(longitudinal.get("stations") or [], pipes, structures, interval)
+    found = keyed_stations(longitudinal.get("stations") or []) or station_keys(
+        longitudinal.get("stations") or [], pipes, structures, interval
+    )
     by_m = {round(at, 3): key for key, at in found.items()}
     return [by_m.get(round(float(s["chainage_m"]), 3)) for s in sections]
 
@@ -179,7 +181,11 @@ def server_route(root: Path) -> dict[str, Any]:
     from B05_Profile.B05_Profile_Engine_Grade_Carry import carry_policy
     from B05_Profile.B05_Profile_Engine_Sections import run_section_generation
     from B05_Profile.B05_Profile_Engine_Sections_Core import SectionGenerationOptions
-    from B05_Profile.B05_Profile_Route_Save_Parts import carry_cross_inputs, station_keys
+    from B05_Profile.B05_Profile_Route_Save_Parts import (
+        carry_cross_inputs,
+        keyed_stations,
+        station_keys,
+    )
     from B05_Profile.B05_Profile_Router import _apply_alignment_edits
     from B05_Profile.B05_Profile_Structures_Repository import load_structures
     from B06_Section.B06_Section_Engine_Design import ROUTE_CARRY_KEYS
@@ -221,7 +227,9 @@ def server_route(root: Path) -> dict[str, Any]:
     _, structures = load_structures(str(root))
     interval = float(options["station_interval_m"])
     old_keys = station_keys(saved["longitudinal"]["stations"], pipes, structures, interval)
-    new_keys = station_keys(new_long.get("stations") or [], pipes, structures, interval)
+    new_keys = keyed_stations(new_long.get("stations") or []) or station_keys(
+        new_long.get("stations") or [], pipes, structures, interval
+    )
     designs = {
         round(float(s["chainage_m"]), 3): s["design"]
         for s in saved["cross_sections"]
diff --git a/resources/tester/test_511_b2_stations_node.py b/resources/tester/test_511_b2_stations_node.py
index a8a5a389b..e0dd427b0 100644
--- a/resources/tester/test_511_b2_stations_node.py
+++ b/resources/tester/test_511_b2_stations_node.py
@@ -199,3 +199,17 @@ def test_등록부_측점_줄_Node():
     ):
         row = src.split(f'no: "{no}"')[1].split("\n  },")[0]
         assert f'runner: "node:{run}"' in row and "until" not in row, no
+
+
+def test_이월_열쇠_Node_출력_없으면_파이썬(project):
+    from B05_Profile.B05_Profile_Route_Save_Parts import keyed_stations, station_keys
+
+    _, noded = _both(project)
+    stations = noded["longitudinal"]["stations"]
+    keyed = keyed_stations(stations)
+    pipes, structures, _ = project["facilities"]
+    assert keyed == station_keys(stations, pipes, structures, 20.0)  # 고정 자료 = 같은 열쇠
+    assert keyed_stations([{k: v for k, v in s.items() if k != "key"} for s in stations]) is None
+    assert keyed_stations([*stations, {"chainage_m": 1.0}]) is None  # 섞이면(구조물 측점 덧) 파이썬
+    route_save = (ROOT / "B05_Profile/B05_Profile_Route_Save.py").read_text(encoding="utf-8")
+    assert route_save.count("keyed_stations(") == 2