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The transport mode for the leg. Use the OSDM ptMode enum. The list of transport modes used in Samtrafiken ACCESS with the corresponding NeTEx value:
https://samtrafiken.atlassian.net/wiki/spaces/SamA/pages/3735617539/Codelist+Attributes+service+properties#Transport-Modes Codelist: ptMode (transport modes)
NeTEx - ServiceJourney.TransportMode
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