Seattle Center Monorail - Technical Details

Technical Details

The line consists of two parallel tracks with one train riding each track.

The fleet consists of two trains constructed by Alweg in 1961. These original trains are still in service and have served the line since its opening in 1962.

Each train is powered by four 750 Hp DC Motors running at 700V and typically drawing up to 700 amps. The motors are controlled by a mechanical motor controller that adjusts the position of the motors and number of resistors in the circuit. The motors run into a standard truck differential, with one side blocked off and the other running to the driving wheel, which runs a standard truck tire.

The electric current is drawn from a two-tiered electric rail that is aligned with the side of the track. The top rail is ground, with the live rail suspended beneath it.

The monorail uses dynamic braking for higher speed braking (over 10 mph), and has drum brakes for lower speeds.

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