I was staying in the centrally located Scandic Residence (that, and availability, being about all it really has going for it) so it was a short walk to the Nidaros Cathedral. From there I wandered over Gamle Bybro (the old town bridge) and up to Kristiansten Fort for views over the city and the fjørd beyond. It was perhaps lucky that I curtailed my sightseeing at this point as, having then gone to bed, I was woken again at about 5am by bright sunshine streaming through a rather ineffective pair of curtains!
Having paid 470kr to get a taxi from the airport to the customer site on the edge of town, on the return journey I took the bus in the morning (40kr) and then the train from the station just opposite the customer location back to the airport (56kr). The train had two additional advantages. Firstly, it doesn’t spend as much time in tunnels, instead skirting the edge of the fjørd giving better views. Secondly, it means I can claim to have been to Hell (even if not back again)!