diff --git a/tests/test_core.py b/tests/test_core.py
index c4b071e..d855a07 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -62,6 +62,9 @@ def make_feed(tmp: Path, shapes=True, files=FILES) -> Feed:
     assert meta["feed_version"] == ("20261017" if files is FILES else "20261020"), meta
     assert meta["trips"] == 1 and meta["stop_times"] == 3, meta
     if shapes:
+        trips = (tmp / "rail" / "trips.txt").read_text()
+        assert "SH1" not in trips  # Verweise auf nicht kopierte shapes werden geleert
+        (tmp / "rail" / "trips.txt").write_text(trips.replace("812,", "812,SH1"))  # wie pfaedle
         (tmp / "rail" / "shapes.txt").write_text(SHAPE)
         prepare.pack_shapes(tmp / "rail")
         assert not (tmp / "rail" / "shapes.txt").exists()
diff --git a/trainpulse/prepare.py b/trainpulse/prepare.py
index ff5cdc3..e0dfb99 100644
--- a/trainpulse/prepare.py
+++ b/trainpulse/prepare.py
@@ -137,6 +137,9 @@ def filter_rail(zip_path: Path, out: Path, version: str | None = None) -> dict:
 
     h, rd = rows(z, "trips.txt")
     trips = [r for r in rd if r[h.index("route_id")] in route_ids]
+    if "shape_id" in h:  # shapes.txt kopieren wir nicht (pfaedle rechnet neu) -> Verweise leeren (z. B. OVapi)
+        for r in trips:
+            r[h.index("shape_id")] = ""
     write_csv(out / "trips.txt", h, trips)
     trip_ids = {r[h.index("trip_id")] for r in trips}
     service_ids = {r[h.index("service_id")] for r in trips}