diff --git a/B06_Section/B06_Section_Section_Drafts.ts b/B06_Section/B06_Section_Section_Drafts.ts
index 1778426f0..29df199eb 100644
--- a/B06_Section/B06_Section_Section_Drafts.ts
+++ b/B06_Section/B06_Section_Section_Drafts.ts
@@ -124,6 +124,11 @@ function decorate(
   const own = pipes.filter((pipe) =>
     fresh.some((section) => near(section.chainage_m, pipe.chainage_m)),
   );
+  // 미리 뜬 횡단은 한 벌을 기억해 다시 씀 — 얹기 전에 관 계열 제원을 비움(앞 종류 제원이 남아
+  // 겹치던 것 · 서버가 얹어 온 저장분 종류도 · 열쇠 = `Section_Store` FACILITY_KEYS 와 같음 · 317-3)
+  for (const section of fresh as unknown as Array<Record<string, unknown>>) {
+    for (const key of ["culvert", "ford", "box", "ford_pavement"]) delete section[key];
+  }
   attachCulvertSets(
     fresh as unknown as Array<Record<string, unknown>>,
     buildCulvertSets(own, registry),
diff --git a/resources/tester/helper_317_kind_change_station.cjs b/resources/tester/helper_317_kind_change_station.cjs
index cb92ed9e5..a26ffa7d0 100644
--- a/resources/tester/helper_317_kind_change_station.cjs
+++ b/resources/tester/helper_317_kind_change_station.cjs
@@ -71,6 +71,17 @@ const snap = () => ({
   state.draftPipes = [{ chainage_m: 50, facility: "ford_pavement" }];
   await withDraftStations(detail, "p1", 1);
   out.back_to_saved = snap();
+  // 여러 번 바꿈 — 앞 종류 제원이 남아 겹치지 않음(317-3 · 미리 뜬 횡단은 한 벌을 다시 씀)
+  const facilityKeys = () =>
+    Object.keys(at50() ?? {})
+      .filter((key) => ["culvert", "ford", "box", "ford_pavement"].includes(key))
+      .sort();
+  state.draftPipes = [{ chainage_m: 50, facility: "box_culvert" }];
+  await withDraftStations(detail, "p1", 1);
+  out.first_switch = facilityKeys();
+  state.draftPipes = [{ chainage_m: 50, facility: "ford_bridge" }];
+  await withDraftStations(detail, "p1", 1);
+  out.second_switch = facilityKeys();
   forgetDraftStations("p1");
   process.stdout.write(JSON.stringify(out));
 })().catch((error) => {
diff --git a/resources/tester/test_317_kind_change_station.py b/resources/tester/test_317_kind_change_station.py
index c143904b7..6323ead84 100644
--- a/resources/tester/test_317_kind_change_station.py
+++ b/resources/tester/test_317_kind_change_station.py
@@ -47,3 +47,9 @@ def test_changed_kind_starts_from_fresh_section(result: dict) -> None:
 
 def test_back_to_saved_kind_restores_saved_section(result: dict) -> None:
     assert result["back_to_saved"] == {"count": 2, "fresh": False, "old": True, "preview": False}
+
+
+def test_repeated_switch_leaves_no_old_kind(result: dict) -> None:
+    # 박스 → 세월교 — 앞 종류(박스) 제원이 남아 겹치지 않음(317-3)
+    assert result["first_switch"] == ["box"]
+    assert result["second_switch"] == ["ford"]