Protrak Grapevine is a hardware and software signalling system for model railroads. Protrak offers a number of hardware devices for DCC to enhance operations. One interesting item is a working track scale.
ProTrak software is designed to simulate operations in a prototypical manner, as are the signalling systems. Grapevine is a combination of hardware and software designed to act quickly and in the same manner as the prototype.
It is only available in Canada and the United States.