The Metro weighs 1,600 pounds, halfway between an intermediate car and a bicycle.
Now most operate with only one intermediate car for different testing purposes.
The $207 million order would comprise seven additional 3-car sets plus 19 intermediate cars.
It consisted of 2-single-ended cab units, and four intermediate cars to make a complete train.
The equivalent savings in the intermediate car would be 800-900 pounds.
Unlike all other intermediate cars, the restaurant car has no doors for passengers.
Power car 401 555 and one intermediate car were brought there by ship.
The glass doors dividing the two major areas of the intermediate cars were opened by proximity sensors.
There are currently 59 units of twelve intermediate cars.