According to this page:
[Raleway] is a display face and the download features both old style and lining numerals,
To follow up on wbond's answer, which should take all the credit for this post, the expert mode in font squirrel will look intimidating at first. But he mentioned the ever important alternate W, which is a pretty big difference for raleway. Note the G is also different between styles.
You simply put "salt" in the OpenType Features box and download your kit.
Then wherever you want to access the salt style, you add this to the css:
-moz-font-feature-settings:"salt" 1;
-ms-font-feature-settings:"salt" 1;
-o-font-feature-settings:"salt" 1;
-webkit-font-feature-settings:"salt" 1;
font-feature-settings:"salt" 1;
Sorry, this should be a comment on that answer but I can't add an image to comments. It would have saved me some time if someone else had this image to show me, so I felt it was worth posting.