12-letter words containing c, u, m, e, r, b
- unencumbered — not impeded, slowed down, or retarded; free to move, advance, or go forward.
- vacuum brake — a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse brake system