I Generate 400 Blocks of Rail in a Line in a Class extends IWorldGenerator.But I got no more than 64 rail,and others disappear.How can I do with it?I guess It can be Chunk problem

Just to check if it is a chunk problem, start a new world so a bunch of chunks will generate at the same time.

its because it gens per chunk.(chunks dosent have 400 in a line), the best way, you can check if the chunk exists (there is a function inside World.java, with the given x , y ,z, if yes, checks if has you rail and the rails in a line dosent bigger than 400, and them do the generation).

The x, y, z must be the x,y,z of you generation but with x +1, z +1 (or something like this, you may understand what i said);

its because it gens per chunk.(chunks dosent have 400 in a line), the best way, you can check if the chunk exists (there is a function inside World.java, with the given x , y ,z, if yes, checks if has you rail and the rails in a line dosent bigger than 400, and them do the generation).

The x, y, z must be the x,y,z of you generation but with x +1, z +1 (or something like this, you may understand what i said);

this is a perfect solution!Thank you  again!