These are dandy geared DC traction machine working very well, yes they were built to last. No arcing on the communicator, MG sets are running smoothly, the size of the MG's I would imagine the DC motors are running at 440 VDC or higher.
That, is a great little video, without narration, just machines doing their work . Excellent audio. Thanks for posting without expletives: like awesome, incredible, vintage...etc Ya know, this is proof we could build stuff to last....but the greed and the push for squeezing blood out of a turnip mentality....not gonna let it happen.