To hand

Einhorn had a teaching turn […] And with his son at the university I was the only student he had to hand.

Now, faults can be diagnosed remotely and (in many cases) fixed before the train even reaches the depot. "It's our version of Formula 1 telemetry," quips Hinze. "It is similar for us to how a pit crew in Formula 1 can understand an issue as the car is coming into the pits - because it has that data to hand already. You know what's wrong before it arrives."