diff --git a/src/vehicle_cmd.cpp b/src/vehicle_cmd.cpp
--- a/src/vehicle_cmd.cpp
+++ b/src/vehicle_cmd.cpp
@@ -629,6 +629,10 @@ CommandCost CmdStartStopVehicle(DoComman
 
 		v->vehstatus ^= VS_STOPPED;
 		if (v->type != VEH_TRAIN) v->cur_speed = 0; // trains can stop 'slowly'
+
+		/* Unbunching data is no longer valid. */
+		v->ResetDepotUnbunching();
+
 		v->MarkDirty();
 		SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, WID_VV_START_STOP);
 		SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);