Tri-Five differences?

[super_kev]

I know this is a truck forum, but I thought I'd ask my question here since I don't know of any other Chevy forums.

I'm looking at getting a '56 Chevy 2 door wagon, and I'd like to know the difference between the 150 and 210. I searched but didn't come up with anything. Is it just a trim package? Does anyone have pictures of restored wagons that will show the difference between a 150 and 210? Also, what's the difference between a wagon and nomad?

Thanks