Optimization of Railway Mixed Goods Loading Layout considering Stability

Algorithm 4

Goods block selection algorithm.

	Input Space set , current layout space , goods block set or , parameter , the width coefficient and depth coefficient of the tree;
	OutputPlace the locally optimal goods block in the current layout space .
(1)	Initialize , create an initial state in the current layout space as the root node
(2)	for each layer of tree// takes
(3)	Select blocks with values in the first to generate sub-states//generate incomplete layout schemes
(4)	If //at layer , each leaf node in this layer is a complete layout scheme, with schemes in total
(5)	Choose the scheme that produces the optimal solution out of schemes
(6)	return place the locally optimal block of the current layout space