Those details confirm these are early-production Minitrix / Aurora "Postage Stamp Trains" models.

The Numbers: The number #950 designates the Minitrix 3041 Union Pacific streamlined observation car, while #960 designates the companion coach or sleeper car.

Western Germany & Metal Wheels: The "Western Germany" stamping indicates they were produced during the late 1960s or 1970s.

The inclusion of original factory metal wheels—rather than the plastic replacements common in later variants—is highly desirable because they improve electrical pickup consistency and track tracking.