Hello I'm newbie in this fascinating hobby

[flesland]

  Hey, friends my name is Nibaldo Soto from Chile South America, i'm recently entering this railroad modeling world and I'm very exciting about, actually I have bought a diesel locomotive EMD FT-A from BACHMANN and 14 days ago I bought a BACHMANN SPECTRUM Heavyweight B&O passengers set (4 pieces) and about this is my question.

What's the differences between Bachmann products and Bachmann Spectrum products ?

Thanks a lot for your answers !!!!

[SteamGene]

Bachmann Spectrum is top of the line.  The current Bachmann Standard lacks some of the detail of Spectrum, but it has the same fine running qualities - at least steam does.  I know little about Bachmann diesels.  The earlier Bachmann stuff is low quality, poorly made, and caused Bachmann to have a bad reputation for years.  Stay away from anything built before 1995. 
Gene

[Santa Fe buff]

It's like the Mustang's in Ford, the best by the company. Or just the better detailed, not to mention some features! Welcome to the hobby,
Coming from Bourbonnais, IL- USA!