Maybe they could save a few million dollars using a floppyEMU or BlueSCSI like thingy 
www.wired.com
San Francisco Will Pay $212 Million for Its Train System to Ditch Floppy Disks
San Francisco Will Pay $212 Million for Its Train System to Ditch Floppy Disks
The city’s light-rail system has used 5¼-inch floppy disks for nearly 40 years. Getting off them won't come cheap.