Would've been more helpful if it were on a cat, then we'd know which one is the EMALS!
looks like the "EMALS". You can see the blast deflector on the broad track is lifted by the
shadow.
It is almost certain by logic that only EMALS can launch UAVs due to its capability of fine tuning the force.
P.S. I still don't get why people think the broader track is EMALS and narrower one being steam though.
And I have heard a proposed idea that both are EMALS of different type. The reason was that the site of the supposed steam cat in Shanghai belongs to institute 704 which is specialized in Electrical equipment, none of their business involves steam such as boiler, piping or valves.