TM,
Get a pair of sprue cutters or wire cutters and clip one or two of the ties off each end. Make sure you save the ties, just cut them under the rail part. Put on the rail joiners, nail or glue down, solder if you like. Then clip the pieces of plastic of the tie so you have just the single ties. Sand the top lightly with sand paper to remove the rail spikes and plates then slide the single tie into the hole that was left under the joiner. When you ballast the track you will never see it!!!