Describe symbolism in The Neon Bible by John Kennedy Toole

In Chapter Ten, the train David is traveling on is symbolic of the toy train he used his whole life as a route of escape. Now the toy train has morphed into a real one, and it is literally taking him away from his problems and the town that has suffocated him from the very beginning. This is a genius writing technique, to take the metaphor of the toy train and turn it into reality for David.