I was going to use railroad ties to build a retaining wall to level my side yard.

*Where do I get a drill bit long enough to penetrate a rr tie? What size bit do I use if I'm drilling to drive rebarr through the hole to connect multiple (up to three) rr ties toghether?
*Where do I get rebar and what do I cut the rebar with?
*What do I cut the rr ties with? Will the creosote mess up a chain saw? Should I use a circular saw or sawzall? A handsaw?

Thanks a bunch!!
Btw, rr ties are on sale for $5 each on S. Birchwood next Saturday via the AK RR.