I have a bunch of sectional track that i was planning on using on my layout. Lasnight as i was laying the track down to plan what pieces i have and what i will need i discovered something and had a thought. Some of this track was purchased at the hobbyshop and some of it came in various trainsets. Now i have a suspiscion that some is steel and not nickel silver. 
How would i go about determining which is which?
By inspecting the track some of it looks slightly different in color, but then I compared that with some slightly aged flex track that I know is NS and could not tell the difference. One thing I did notice on the pieces that are made by bachmann that they have small numbers on them. I found 2 9" straights with different numbers (2 & 4) but could not see anything different.
Thanks for the help

How would i go about determining which is which?
By inspecting the track some of it looks slightly different in color, but then I compared that with some slightly aged flex track that I know is NS and could not tell the difference. One thing I did notice on the pieces that are made by bachmann that they have small numbers on them. I found 2 9" straights with different numbers (2 & 4) but could not see anything different.
Thanks for the help