Arc Timeline was able to detect subway (metro) use. Arc Timeline 4 consistently show a jump between entering at one subway station and exiting another, no line or travel method in between.
Hi @Smorg!
The next update - hopefully coming this week - should improve things for underground train recording. The improvements aren’t specifically targeting that mode of transport, but the nature of them is such that they should help improve things there anyway.
Then next month I’ve scheduled some time for doing specific underground train testing and fixing once I’m back in Bangkok. There’s no underground trains in Bali, where I am now! So it’s difficult to do that work just yet 
But yeah, the next update (hopefully this week) might improve things pleasingly, and then next month there should be another update that specifically deals with underground train recording.
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