Children will love playing with this durable, die-cast, rolling Thomas & Friends engine of nia, Thomas� latest friend introduced in the Thomas & Friends movie, big world! big adventures!? (sold separately and subject to availability). nia is a fun-loving, optimistic, fair and kind engine from Africa. She�s very creative and loves to speak her mind! perfect for use with Thomas & Friends adventures train sets (sold separately and subject to availability)! with Thomas & Friends adventures, your child and Thomas can go wherever their imaginations take them!