Yes, though the main reasons they usually terminate short at Timperley (besides being able to turn and catchup 10 minutes on the timings) are usually power issues on the next section due to Traffords notoriously unreliable domestic grid (Altrincham residents have more power cuts than I have hot dinners). And the operational constraints of double barriered crossings shared with NR and road users (so for example if they are bunched up they turn every second unit until the timings are restored to normal).