If you ever get to Belgium, see the Museum of Public Transportation in Liege. Until then you can take the virtual tour online

On the left is a mobile work station built in 1893. It was used to set up and then repair overhead power lines. After the Second World War, this car was still used to rehabilitate the network Air which had sustained heavy damage following the bombings.

http://full-vision.be/mdtec/  for the virtual tour, or see the museum's website at http://www.musee-transports.be/fr/musee/collection.html

Thanks to John for letting me know about this!