maps/drawable-anydpi-v21/ic_directions_railway_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M4,15.5C4,17.43 5.57,19 7.5,19L6,20.5v0.5h12v-0.5L16.5,19c1.93,0 3.5,-1.57 3.5,-3.5L20,5c0,-3.5 -3.58,-4 -8,-4s-8,0.5 -8,4v10.5zM12,17c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2zM18,10L6,10L6,5h12v5z"/>
</vector>