I think it's great the NYC Subway preserves and takes their old equipment out for a spin once and a while for special events and such.
Although about a 99.99992% chance of this not happening, It would be great to see the MBTA preserve some of their transit history and find a way (grant $$$??) to restore the four 01400's to operation, save a set of 01500's/01600's, and save a set of the Hawker-Siddeley Orange Line cars. Run them Sunday mornings, when ridership is lighter when nothing huge is going on & bring them out for noteworthy special events..
Just an idea..