after taking the first group to train, Alyx says, go get another group but when i go back again, Barney along with two NPC (a medic and a gunner) just remain there.
no one follows me back to the train. if i press "use" (e) on berney, he says, "Move 'em out", "Protect the citizens, Get them to the trains" but no body comes with me

tried ai_norebuildgraph 0
then reload, no use.

I am stuck in the same place... please can you tell me if you found a fix for this?

(I own the proper copy of the game...noticed bugs like this can sometimes happen to pirated copies)

First of all are both of your games been fully updated by Steam?? All you have to do is leave barney and head for the buildings across the yard and the citizens will follow you.

Just go to the area you are supposed get them to. It's possible that it's just a temporary glitch.