Ok, first of all: Do NOT upload .bmp files to your site/server/whatever.
They are hugie-biggie-fattie. It takes ages to upload and load. Use .jpg.
For the problem: I dont really know :
Make the train an entity... And some of the blocks cutting up the floor.
I understand it can be hard deleting that train, but try to minimize detail (From this pic, I can see some close windows) and look over the interior (which I cant see
).
The picture finished loading at 2.4(!!!) megabytes.