What about try using a Tortoise switch machine ? I don't know anything about DCS or LCS, but, can't a Tortoise switch machine be controlled by a DCS system ?
If you have a roundhouse with more than 2 doors that might be work to cram in the switch machines under the layout.
I typed in a search for Servos and found this. Servos used to open roundhouse doors.
http://www.heathcote-electronics.co.uk/servo.html
How bout that !
Or go old school and try using an automotive choke cable.
Steve