.train {
    background-image: url('/build/images/train.jpg');
    background-position: center;
    background-size: cover;

}

.train::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0, 0, 0, 0.4); /* 40% black transparent layer */
    z-index: 1;
}