diff --git a/src/loaders/shuttle/__tests__/ApiBasedShuttleRepositoryLoaderTests.test.ts b/src/loaders/shuttle/__tests__/ApiBasedShuttleRepositoryLoaderTests.test.ts
index 3f0ff94..799b2bd 100644
--- a/src/loaders/shuttle/__tests__/ApiBasedShuttleRepositoryLoaderTests.test.ts
+++ b/src/loaders/shuttle/__tests__/ApiBasedShuttleRepositoryLoaderTests.test.ts
@@ -5,7 +5,7 @@ import { fetchRouteDataSuccessfulResponse } from "../../../../testHelpers/jsonSn
 import {
   fetchStopAndPolylineDataSuccessfulResponse
 } from "../../../../testHelpers/jsonSnapshots/fetchStopAndPolylineData/fetchStopAndPolylineDataSuccessfulResponse";
-import { generateMockRoutes, generateMockStops } from "../../../../testHelpers/mockDataGenerators";
+import { generateMockRoutes, generateMockShuttles, generateMockStops } from "../../../../testHelpers/mockDataGenerators";
 import {
   fetchShuttleDataSuccessfulResponse
 } from "../../../../testHelpers/jsonSnapshots/fetchShuttleData/fetchShuttleDataSuccessfulResponse";
@@ -206,6 +206,49 @@ describe("ApiBasedShuttleRepositoryLoader", () => {
       expect(shuttles.length).toEqual(0);
     });
 
+    it("prunes shuttles correctly", async () => {
+      const distanceMiles = 1;
+      loader = new ApiBasedShuttleRepositoryLoader(
+        "263",
+        "1",
+        new UnoptimizedInMemoryShuttleRepository(),
+        distanceMiles,
+      );
+
+      // Add mock shuttles to repository (these should be pruned)
+      const shuttlesToPrune = generateMockShuttles();
+      await Promise.all(shuttlesToPrune.map(async (shuttle) => {
+        shuttle.systemId = systemId;
+        await loader.repository.addOrUpdateShuttle(shuttle);
+      }));
+
+      const routes = generateMockRoutesWithPolylineCoordinates();
+      await addMockRoutes(routes);
+
+      const modifiedSuccessfulResponse = getMockJsonResponseMatchingRouteAndCoordinates(
+        routes[0],
+        "-117.86187",
+        "33.78792"
+      );
+
+      updateGlobalFetchMockJson(modifiedSuccessfulResponse);
+
+      // Update shuttles from API
+      await loader.updateShuttleDataForSystemBasedOnProximityToRoutes();
+
+      // Old shuttles should be pruned, only API shuttles should remain
+      const shuttles = await loader.repository.getShuttles();
+      const busesInResponse = Object.values(modifiedSuccessfulResponse.buses);
+
+      expect(shuttles.length).toEqual(busesInResponse.length);
+
+      // Verify none of the original mock shuttles remain
+      shuttlesToPrune.forEach((originalShuttle) => {
+        const foundShuttle = shuttles.find(s => s.id === originalShuttle.id);
+        expect(foundShuttle).toBeUndefined();
+      });
+    });
+
     it("throws the correct error if the API response contains no data", async () => {
       updateGlobalFetchMockJsonToThrowSyntaxError();