Where can I dispose of old kerosene railroad ties?

Answer 1

If there in good shape advertise in the local paper or weekly trader for free ties.
You'll find that people will be calling to pick them up as long as they can save a buck.
If they're rotten or in bad shape then there are waist recycling yards that take all building materials in almost all communities.

Answer 2

create garden layers for landscape.
put an ad out for freebie railroad ties, you pick up.
see what happens.