diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index 8fcb666..ab41a9f 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -973,7 +973,9 @@ CommandCost CmdBuildSingleSignal(TileIndex tile, DoCommandFlag flags, uint32 p1,
 		MarkTileDirtyByTile(tile);
 		AddTrackToSignalBuffer(tile, track, _current_company);
 		YapfNotifyTrackLayoutChange(tile, track);
-		if (v != NULL) TryPathReserve(v, true);
+		if (v != NULL) {
+			if (!v->current_order.IsType(OT_LOADING) || !IsSafeWaitingPosition(v, v->tile, v->GetVehicleTrackdir(), true, _settings_game.pf.forbid_90_deg)) TryPathReserve(v, true);
+		}
 	}
 
 	return cost;