"Good luck ... both New York and Boston are in the process of updating their subway cars. Boston is scheduled to start receiving its new cars this year. New York starts 2020. In both cases, multiple cars designs in use will be replaced by a single design. As an FYI some of these cars are up to 40 years old."

"A couple of interesting facts about these roll up signs: 1] there are standards around them, and they are lengthly; 2] Signs cost anywhere from USD 275 upwards; 3] They do deploy a dual torsion spring which is designed to deal with wind. It's the small box at the base of the mast, where the feet join. Though I'd expect that the overall weight of the unit allows it to be pushed about - either by the wind or vehicles; 4] Ballast plate [approx. 35 pounds -steel and rubber] can be obtained for an additional cost [$120 though discounts for volume]. These plates are stackable. As to storage I have no info, though would expect that they remain on the truck as part of the standard equipment."