Something that seems to be used in the locomotive brake system. I haven't seen it, either. Who knows? It's better for the locomotive system to go back. Thank you！！
When the skateboard wear to the limit, only in the maintenance of the daily locomotive can be replaced, so that although it is more troublesome, but it is always better than the replacement of contact wire.
The texture of the skateboard is relatively soft, so the main loss in contact with the contact wire is on the slide plate, and the wear of the contact wire is very small.
The pantograph's bow head has several detachable electrically conductive strips of carbon or powder alloy used to contact the contact wire and power it from above.
