It IS a great spot - and thanks for the explanation of Kazan.
The engineer north of Tsingtao was actually going to build a city that was decided upon a while ago. It will go in the spot to get the fish and the whales there.
How about this: Engineers are pretty cheap to rush, so why not use the one that's on the Mongol island right now? We can get a few others up and running fairly quickly, there.
The rails on the Mongol can wait a few turns now as we're now moving down from Aleppo and not out of Basra any longer. Though we will get them up quickly once a few engineers are rushed.
This will likely mean THREE cities will be created in the next batch of turns: The "sweet spot", north of Heidelberg, and in the Triton Province. Lots of names to dish out, and I think I have some ideas.