It's only been 40 years since the T bought new Orange Line cars. New ones are scheduled to debut in December 2018. But if you want an early look at them, stop by City Hall Plaza on Tuesday or Wednesday. A model of the new edition trains is on display Tuesday and Wednesday from 7 a.m. to 7 p.m. It's only 66 percent the size of the actual cars, but it gives a good idea what to expect. The cars will be manufactured in Springfield by a Chinese company.