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It looks like the Washington, D.C. Metro is using DESFire EV1 cards with the new payment system pilot that goes live this morning (2015-02-23).
TYPE : NXP MIFARE DESFire 4k | DESFire EV1 2k/4k/8k | Plus 2k/4k SL3 | JCOP 31/41
MIFARE DESFire EV1 (MF3ICD41)
Maximum NDEF storage size after format: 4094 bytes
Capacitance: 17pF
Protocol: ISO/IEC 14443-2 and -3 / ISO/IEC 14443-3 and -4
http://paymentpilot.wmata.com/about/
https://mpp.wmata.com