I love this app but fix this and add it

Ive been having trouble loading world and when I go to the world or change the train,it logs me out which is the home screen and it goes slow and can you fix this problem and can you put the southern pacific 4449 because I love that train which is southern pacific 4449.please fix the problem and add Union Pacific 4014,844,and southern pacific 4449.Oh and one more thing can you put building level (aka make your own world).please put the trains,fix the problem,and put building level.
Thanks,
Bolt4449

Bolt4449 about Train Sim