They do - two of them per bay in fact. But neither has enough travel to reach the very end of a cab car when the train is parked in it, and thus they've had to build an additional crane solely to deal with the weight of these new windshields.
And how many of those pieces of rolling stock use 1" thick CFR 49.223 bullet-resistant glass that is almost 10 feet wide by 4 feet tall? The windshield used on the CEM cab cars is going to weigh in the neighbourhood of 2500 pounds by itself.
It's needless, considering that they could have done the same thing with 3 or 4 smaller pieces of glass - like on the MP40s - to achieve the same amount of safety at less cost (a crack anywhere in the windshield will require its replacement, regardless of size) and with less issues in handling and installation.
Dan
Toronto, Ont.