Which train is the fifth one?
The purple train is the fifth one.
Which train is the second one?
The green train is the second one.
What color is the second train?
It's green.
What color is the third train?
It's gray.
What color is the sixth train?
It's brown.
What color is the ninth train?
It's orange.
What is the ordinal number of the red train?
It's first.
What is the ordinal number of the pink train?
It's fourth.
Which train is the eighth one?
The blue train is the eighth one.
What is the ordinal number of the black train?
It's seventh.