U 42

U 42 is an abbreviation for:

• a subway line in Dortmund, see Stadtbahn Dortmund #Liniennetz
• a submarine built for the German Imperial Navy, see Balilla (ship, 1915)
• U 42 (Kriegsmarine) , a submarine of the German Wehrmacht in World War II

This is a disambiguation page for differentiating between several terms identified with the same word.