Question

is there a force of friction between the wheels of a moving train and iron nails

Answer 1

Yes, there is a force of friction. When 2 objects are in contact friction is present.

Answer 2

yes
------------------
yes there a force of friction between the wheels of a moving train and iron nails

only when there is a force of friction objects can move

and whenever any objects are in contact with each other there will be a force of friction action on that object but it will be opposite to that of the direction of applied force