[A]  Auto button provided for route indicated
[R]  Main route which is approach released from Red
[Y]  Main route which is approach released from Yellow
[1], [2], [3]  Preference order of alternative routes 
{ }  Intermediate signals which are pre-set for this route

Platform 2 and the Motorail dock are accessed through hand-point 783. To get a train in, route as normal. To get a train out, set 783 hand-point for the correct siding from which your train is coming, then clear 582 signal. Don't forget to give the train a 'shunt to 533' command if it needs to shunt back towards the main station, otherwise it will disappear into Pylle Hill Sidings!