The MPD™ (MULTI-PURPOSE DEVICE) device from CMC Rescue can take the place of much of the equipment needed when doing rope rescue operations. The great thing about this device is that it greatly simplifies the main line by having this one device do all of the work for both raising and lowering without having to reconfigure the equipment. Additional information is available at the above link.
Above are two photos demonstrating the MPD™ system.
Below are a three short videos that will get you familiar with the MPD™ and how it functions.
Tech Rescue Training Highlights Featuring the MPD™ | Part 1: Introduction
Tech Rescue Training Highlights Featuring the MPD™ | Part 2: Operation
Tech Rescue Training Highlights Featuring the MPD™ | Part 3: Practice Tips