diff --git a/src/main/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleService.java b/src/main/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleService.java
index 07fa48fa84f..0058cdd9e15 100644
--- a/src/main/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleService.java
+++ b/src/main/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleService.java
@@ -8,7 +8,6 @@
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 import javax.annotation.Nonnull;
 import org.opentripplanner.service.realtimevehicles.RealtimeVehicleRepository;
@@ -33,8 +32,16 @@ public DefaultRealtimeVehicleService(TransitService transitService) {
     this.transitService = transitService;
   }
 
+  /**
+   * Stores the relationship between a list of realtime vehicles with a pattern. If the pattern is
+   * a realtime-added one, then the original (scheduled) one is used as the key for the map storing
+   * the information.
+   */
   @Override
   public void setRealtimeVehicles(TripPattern pattern, List<RealtimeVehicle> updates) {
+    if (pattern.getOriginalTripPattern() != null) {
+      pattern = pattern.getOriginalTripPattern();
+    }
     vehicles.put(pattern, List.copyOf(updates));
   }
 
@@ -43,8 +50,18 @@ public void clearRealtimeVehicles(TripPattern pattern) {
     vehicles.remove(pattern);
   }
 
+  /**
+   * Gets the realtime vehicles for a given pattern. If the pattern is a realtime-added one
+   * then the original (scheduled) one is used for the lookup instead, so you receive the correct
+   * result no matter if you use the realtime or static information.
+   *
+   * @see DefaultRealtimeVehicleService#setRealtimeVehicles(TripPattern, List)
+   */
   @Override
   public List<RealtimeVehicle> getRealtimeVehicles(@Nonnull TripPattern pattern) {
+    if (pattern.getOriginalTripPattern() != null) {
+      pattern = pattern.getOriginalTripPattern();
+    }
     // the list is made immutable during insertion, so we can safely return them
     return vehicles.getOrDefault(pattern, List.of());
   }
diff --git a/src/test/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleServiceTest.java b/src/test/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleServiceTest.java
new file mode 100644
index 00000000000..a1c9dddaab0
--- /dev/null
+++ b/src/test/java/org/opentripplanner/service/realtimevehicles/internal/DefaultRealtimeVehicleServiceTest.java
@@ -0,0 +1,55 @@
+package org.opentripplanner.service.realtimevehicles.internal;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.opentripplanner.framework.geometry.WgsCoordinate.GREENWICH;
+import static org.opentripplanner.transit.model._data.TransitModelForTest.route;
+import static org.opentripplanner.transit.model._data.TransitModelForTest.tripPattern;
+
+import java.time.Instant;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.opentripplanner.service.realtimevehicles.model.RealtimeVehicle;
+import org.opentripplanner.transit.model._data.TransitModelForTest;
+import org.opentripplanner.transit.model.network.Route;
+import org.opentripplanner.transit.model.network.StopPattern;
+import org.opentripplanner.transit.model.network.TripPattern;
+import org.opentripplanner.transit.service.DefaultTransitService;
+import org.opentripplanner.transit.service.TransitModel;
+
+class DefaultRealtimeVehicleServiceTest {
+
+  private static final Route ROUTE = route("r1").build();
+  private static final TransitModelForTest MODEL = TransitModelForTest.of();
+  private static final StopPattern STOP_PATTERN = TransitModelForTest.stopPattern(
+    MODEL.stop("1").build(),
+    MODEL.stop("2").build()
+  );
+  private static final TripPattern ORIGINAL = tripPattern("original", ROUTE)
+    .withStopPattern(STOP_PATTERN)
+    .build();
+  private static final Instant TIME = Instant.ofEpochSecond(1000);
+  private static final List<RealtimeVehicle> VEHICLES = List.of(
+    RealtimeVehicle.builder().withTime(TIME).withCoordinates(GREENWICH).build()
+  );
+
+  @Test
+  void originalPattern() {
+    var service = new DefaultRealtimeVehicleService(new DefaultTransitService(new TransitModel()));
+    service.setRealtimeVehicles(ORIGINAL, VEHICLES);
+    var updates = service.getRealtimeVehicles(ORIGINAL);
+    assertEquals(VEHICLES, updates);
+  }
+
+  @Test
+  void realtimeAddedPattern() {
+    var service = new DefaultRealtimeVehicleService(new DefaultTransitService(new TransitModel()));
+    var realtimePattern = tripPattern("realtime-added", ROUTE)
+      .withStopPattern(STOP_PATTERN)
+      .withOriginalTripPattern(ORIGINAL)
+      .withCreatedByRealtimeUpdater(true)
+      .build();
+    service.setRealtimeVehicles(realtimePattern, VEHICLES);
+    var updates = service.getRealtimeVehicles(ORIGINAL);
+    assertEquals(VEHICLES, updates);
+  }
+}