It was the only segment of the system running through the urban core that had access to the Brentwood service and inspection shop and rolling stock storage yard. All of the other service and inspection shops and yards are at or near the ends of their respective lines. The line to New Carrollton was opened 2 1/2 years later because the yard at the end of that line had the capacity to store the remainder of the first order of 300 cars. Brentwood is only big enough for roughly 100 cars.