Answer:
A large oasis in the desert. Come with cash and leave with none. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
Four fingers and a thumb, yet flesh and blood I have none. What am I?
When you buy me I am costly, but the only use I have is hanging only. What am I?
What is the edge of earth and bread?
The sun bakes them, The hand breaks them, The foot treads on them, And the mouth tastes them. What are they?