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Re:ArcaOS 5.0 now available: new OS/2 distribution by notmtaemployee on Wednesday May 17, 2017 @05:47PM (#14363109)
They run Windows NT 4 on the mvm and even have a custom badged start up screen http://salim.virji.net/pix/transit/mta/crashed_metrocard_ven...

The OS/2 stuff is used on the back end of the metro card system.

Re:ArcaOS 5.0 now available: new OS/2 distribution by Grazester on Thursday May 18, 2017 @08:10AM (#14366545)
Ah so they use OS/2!