All you need is money.
I was in North Korea in Dec.93. At that stage, I wasn't a Paddleducks subscriber. The country would do anything for me, at USD100 per day. I was travelling for only 1 day at that price. I was to be given a guided tour of a railway workshop on my arrival day, but my train was 8 h late. I missed that tour. My guide took me from the station in darkness to a 1000 bed hotel, where we were the only two customers in the whole establishment. Next morning, I got a tour of the metro and along some city streets (viewing trams without riding them). Photography was not restricted. I left at 10.00 on the world's longest single-train journey: via Hasan to Moskva.
So, don't be deterred: somebody on GBP (a better excange rate than I get) can go there, preferably as a duo or quartet, and get the coverage.
I am assuming that the river passes through the capital.
Such a trip could fit with heading to Yakutsk, but after three failures Bill W's group has abandoned all hope.
Regards,
Roderick B Smith
Rail News Victoria Editor