Thanks for getting back to me so soon! I was getting the following:
{"$type":“Tfl.Api.Presentation.Entities.RouteSequence, Tfl.Api.Presentation.Entities”,“lineId”:“northern”,“lineName”:“Northern”,“direction”:“all”,“isOutboundOnly”:true,“mode”:“tube”,“lineStrings”:[],“stations”:[],“stopPointSequences”:[],“orderedLineRoutes”:[]}