http://www.tugspotters.com/tempframeset.php?id=foto.htm
http://www.vesseltracker.com/
JHB,
Try the above links;
I'm for the expecifications and structures particulars. Those tugs looks like Robert Allan Projects. (As this project is from Canada too).
Attached are 2 photos of the SMIT TUPY (ASD's Class tug) 3300Hp 50tons Bollard pull / Robert Allan project.
Cheers
Tavares