[pierreh]

It always pays to revisit old documentation - when it exists and is available. In the particular case, a visit to the SimCity Devotion site. and a little bit of searching about 'ESURE' led me to the original documentation, where I could read, in bold face, about the SURC pieces: "when you place them, the arrow should always point toward the underground rail line". Aha,  insight!

I tested this in another city, in which I found a case where I could implement an ESURE setup, and of course it worked. Then I returned to Deramey and inverted the direction of the two SURC pieces (I had them pointing to the subway side). Sure enough, very soon after that change the ESURE setup was functional. It can be seen in orange in the center of this picture:



Actually, after I had taken that picture, the link got saturated, the rail line and its ESURE subway segment reached the dreaded 65635 limit. Now I have a new issue to solve, the excessive traffic on that railwa line - it is more than before I implemented the ESURE setup. But I do not mind having to solve that type of problem.