Restored and recently returned to service is North Eastern Railway's 3170 seen here at Embsay Station. The 1903 Electric Autocar spent a good few years in a field before donations, lottery money and hundreds of hours of work got her into this pristine condition. The "business" end, now with a diesel generator rather than petrol to generate the electricity, is very much a "black" box within the far quarter of the autocar.
en.wikipedia.org/wiki/1903_Petrol_Electric_Autocar
Uploaded to Flickr by ARG_Flickr on 20 June 2019
Photo © ARG_Flickr, 20 June 2019. Licensed for reuse under this Creative Commons licence