The company that is putting in the trains together with the cables and winches has unsurprisingly won a 5 year contract with an additional potential 5 year extension to maintain it. Reading between the lines (no pun intended) during the off peak I think only one train will run, which will allow maintenance down time. Also there is no track switching or provision of spare rolling stock so if there was a cable fault on one track and a train fault on the other there would be no service. Looking at how many times the simple lifts break down in the multi-storey no doubt this will be happening. Basically a lift is a Dart but just operates up and down on a short track.