I would think that you'd need each program's 'own' code on train connexions to get miles/segments in that program. For the AMS-Brussels/Antwerp run, I can't find any other SkyTeam airline that offers a train connexion (the DL website doesn't recognize "ZYR" at all).

There may be other train links avaliable around Europe, though, and also in the US. I know in the 'old days', CO used to codeshare with Amtrak on some NE Seaboard connections, and these used to earn miles in their program.

There is also, I believe, a Bus connexion* somewhere in Canada available through SkyTeam.

-- Henry

* And, as frequent CityJet travellers to CDG know, FB members don't get qualifying segments for the bus ride from the Terminal G parking stand to 2E.