They seem to be made of plastic conduit. Maybe some sort of inductive sensor that makes 100% sure there is actually a big metal car present before allowing the doors to open?
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I was first thinking sprinkler system, but that does not go well with plastic. – winny Sep 15 '20 at 22:09
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Part of TPWS-like system? https://en.m.wikipedia.org/wiki/Train_Protection_%26_Warning_System – mbedded Sep 15 '20 at 22:59
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Alignment beacons for the doors? – Jeroen3 Sep 16 '20 at 07:20
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The shape and position certainly suggests a magnetic antenna, or really just one half of a low-power transformer, with the matching counterpart on the top of the train.
Inferring from the use case: might be a simple way of exchanging data with the train; it's probably going to be rather low-bandwidth (seeing that the carrier frequency couldn't be high and loops are inherently relatively narrow), so low-rate, but probably enough to exchange a short audio sample and maybe time information in the station, or to transmit "train speaker grade" live audio.
It all reminds me of the inductive wireless audio systems for hearing aids.
Marcus Müller
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