U-1

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U-1 is a conjunction of the letter U and the number 1 and is often used as a code, production number or callsign for an object.

[edit] Military

[edit] Railway

A number of cities in German speaking countries possess Underground railway networks known as U-Bahns. The first line of these railway systems is always shortened to U-1. The following systems have a U-1 Line:

In other languages