Dead beat galvanometer: when a galvanometer is used for measuring current the coil is wound on a light aluminium frame to bring coil quickly to rest .This is because the motion of metal frame in magnetic field give rise eddy current in frame.
Electric break : when current is to stop the power supplies to rotates the axis is switched of .At same time a stationary magnetic field is applied to rotating durm give rise to strong eddy current in drum . This eddy current produce torque which oppose rotation and stop a train smoothly and quickly