Thank you for your help!
This will have what you need. Instructions and diagrams. You're interested in option 3 "AC wiring with steering diodes".
http://www.mgbrr.org/tips/an6000-1.pdf
I am a relatively new member of the model railroading community and have made the decision to switch from under table atlas switches to the tortoise machines. I have a MRC AC transformer and would like to figure out how to wire these with SPDT switches. I have a total of five tortoise machines to wire (please do not laugh!). Since I am easily confused, a diagram if possible would also be helpful. My main lines are DCC powered and I am aware that I could control these with decoders but would like to wire the machines via wire. Thank you for any assistance.
Dave