2-6-0 Pulling power

So today I had a chance to bring the weathered Bachmann CN 2-6-0 loco from my previous post to the clubhouse and run it on a big continuous  loop layout instead of my small 6ft shunting layout. I wanted to see how many 40-50ft. HO railroad cars it could pull. This loco has no traction tires btw.
End result....it easily pulled 12 cars with just a bit of wheel-slip at the start...but the layout is flat so no grades. I think it might have trouble pulling 12 up a grade but on the flat it was fine...I wouldn't do it too long for fear of over-heating the decoder. I then ran a 9-car train for a good half hour,forwards and backwards with no problem at all.
Here are a couple of pics.