diff --git a/OpenNest.IO.Tests/ClampRailPersistenceTests.cs b/OpenNest.IO.Tests/ClampRailPersistenceTests.cs
index 042e93a..3c2c88b 100644
--- a/OpenNest.IO.Tests/ClampRailPersistenceTests.cs
+++ b/OpenNest.IO.Tests/ClampRailPersistenceTests.cs
@@ -470,6 +470,22 @@ public class ClampRailPersistenceTests
         Assert.Equal(edge, kept.EdgeSpacing.Left);
     }
 
+    // Delta review: a sheet whose rail differs from the defaults only in removal time is
+    // configured stock too (ChangePlateDefaults leaves it alone) and must be written.
+    [Fact]
+    public void EmptySheetOnARailWithOtherRemovalTimeIsKept()
+    {
+        var nest = new Nest("railed");
+        nest.PlateDefaults.Size = new Size(48, 96);
+        nest.SetClampRail(Machine());
+        var plate = nest.CreatePlate();
+        plate.SetClampRail(new ClampRail(1.5, 0.625, MachineCenters, removalMinutes: 7));
+
+        var kept = Assert.Single(RoundTrip(nest).Plates);
+
+        Assert.Equal(7, kept.ClampRail.RemovalMinutes);
+    }
+
     /// <summary>Removes a named property wherever it appears in the document, simulating a
     /// key an older writer never emitted. Rebuilds via <see cref="JsonNode"/> so the result
     /// is always valid JSON regardless of whether the property was first, last or only one
diff --git a/OpenNest.IO/NestWriter.cs b/OpenNest.IO/NestWriter.cs
index 6a07c9a..fa96542 100644
--- a/OpenNest.IO/NestWriter.cs
+++ b/OpenNest.IO/NestWriter.cs
@@ -201,7 +201,8 @@ namespace OpenNest.IO
         /// <summary>
         /// True when a plate created from the saved defaults would be this sheet's clamp
         /// configuration: same size, quadrant, edge and part spacing, no last-resort
-        /// removal, and zones the saved rail recreates (C17: anything else is configured
+        /// removal, not following another rail (removal time included), and zones the
+        /// saved rail recreates (C17: anything else is configured
         /// stock and is written).
         /// </summary>
         private bool DefaultsRecreateClamps(Plate plate)
@@ -217,6 +218,7 @@ namespace OpenNest.IO
                 && plate.EdgeSpacing.Bottom == defaults.EdgeSpacing.Bottom
                 && plate.EdgeSpacing.Right == defaults.EdgeSpacing.Right
                 && plate.EdgeSpacing.Top == defaults.EdgeSpacing.Top
+                && (plate.ClampRail == null || Equals(plate.ClampRail, rail))
                 && rail.Matches(plate);
         }