You do need to get stations for the GLR network. They are not included in the NAM. The RTMT set can be found here and the Addon set here. There are other stations available. You might search the STEX for GLR Stations.
Also, make sure you have the correct drive-side component of NAM installed. Improper files could cause rail networks not to function.
Fantastic! Thanks CaptCity, I finally have tram running. I don't see them on the city view but I verified with the traffic volume control. It is just too bad there are only GLR station on avenues, I guess my tram on street ways will only be for the "pittoresque" .
Thanks again.