Measure and mark off the area in which you'll install the steps, using landscaping spray paint. Mark the step and riser locations onto the marked-off pathway.
Dig out the steps and risers, using a shovel. Dump the dirt into a wheelbarrow for removal from your property. Dig down to the depth of the railroad ties and dig out a step that's as wide as the ties are long.
Tamp down the step area of the dug-out ground, using a plate compactor to create a level surface for the steps.
Position one railroad tie at the front edge of each step. Drill four evenly spaced holes through each railroad tie with a 3/8-inch drill bit. Firmly seat the tie into place. Drive 3/8-by-18-inch rebar down through the holes in the railroad tie and into the ground, with a mallet.
Fill in the remaining portion of the steps behind the railroad ties with gravel. Tamp down the gravel with a plate compactor to create a firm surface.