It's no doubt much bigger, but that loco reminds me of the old Austrian 1670, which is about the same age.
That was a nice loco... 15kV 16 2/3 Hz overhead power, transformer with various taps for speed control and auxiliary power, huge solid contactors...
At the company we don't lock out the pantograph, but we switch off, lock out and ground the catenary of the track with the car we're working on. All ladders being used are grounded _and_ ground the catenary separately too. That seems to be a fairly safe arrangement.
I once had the fun of painting the roof of a historic loco for example.
www.railfaneurope.net is quite a nice site with pictures.
