#trainAnimationElement {
    width: 100px;
    position: relative;
    -webkit-animation: linear infinite;
    -webkit-animation-direction: normal;
    -webkit-animation-name: run;
    -webkit-animation-duration: 15s;
}

@-webkit-keyframes run {
    0% {
        left: 0;
        opacity: 0.0;
    }

    10% {
        opacity: 1.0;
    }


    90% {
        opacity: 1.0;
    }

    100% {
        left: calc(100% - 100px);
        opacity: 0.0;
    }
}