I am not sure if the K-Line by Lionel remote will work with K-Line operating cars, I don't have any experience in that area. I just know that Lionel picked up a lot of K-Line items and put the Lionel name on them.
If gunrunnerjohn says it will then it should.
However I do know that K-Line's remote won't work with Williams or Williams by Bachmann operating cars. Also Williams remote won't work with with Williams by Bachmann operating cars but the Williams by Bachmann remote is supposed to work with all K-Line and Williams operating cars, at least that is what Bachmann claims.