Jim is correct. Twisted wire is used because the ACC uses constant 2-way communication between the decoders and the controller. The twist helps keep the signal clean and prevent outside interference like high voltage power lines nearby.
And Sprinkus is correct. There is a very slight amount of surge resistance afforded by twisted wires, but it is pretty minimal. Preaching to the choir but that's where inline surge arrestors tied to a 10-ohm ground (or less) is way more effective.
(Side Note: Ha! I'll have to give Dee and Dave a hard time, but it's more fun if you do it!)
JohnsonsLawnManagement - I hope you made a successful repair. Thanks for posting the question.