var viewer = new Cesium.Viewer('cesiumContainer');

var lines = viewer.scene.primitives.add(new Cesium.PolylineCollection());

for(var i = 0; i < 1000; i++) {
    var positions = [-75+i, 35, -60, 40];

    lines.add({
        positions: Cesium.Cartesian3.fromDegreesArray(positions),

        material: Cesium.Material.fromType(Cesium.Material.PolylineGlowType, {
            glowPower: 0.05,
            color: Cesium.Color.RED
        }),
        width: 10.0
    });
}