mmm... interesting... I'm still searching but still founded nothing...
What I know is that the book is told in the perpectivo of Susan, Susan finds out about the accident of the train by the radio, and she goes to live with her Uncle Harold and Aunt Alberta, and in a dream that she had Aslan talked to her, but Susan was uncapable to untherstand what he was saying, when she woke up she remembered everything about narnia, meanwhile all her friends in Narnia asked Aslan to bring Susan back to narnia, but he told them that Susan should find the way back by herself, time later some moles find a little forrest of coats go inside and founded a door that lead them to a wardrope a little damage, So the other 3 Pevensies planed to go to that part of the forrest because they remember that the wardrope was the pass to go to the Profesor's house and from there they could come back to our world, in that way the Pevensies and a small army of dwarfs, minotaurs, centaurs etc, came into our world in search of queen Susan.
The person who wrote this on the forum of course is not sure if the information is true or not, and when Lewis got to the last part I told u about he died.
I really don't know if I could believe or not, but I'll will search more until I found something.