Am I right to assume, that the vehicle depicted is this one? (I mean type, not the particular specimen?
https://trainspo.com/model/1770/
https://nl.wikipedia.org/wiki/TPF_Be_4/4_(151-152)
If so, then the available info says that the car (single) is 16,81m long.
Yours is over 20 meters long.
I know it sounds hard, but I suggest You rather try finding a blueprint, preferably one that has all the measurements on it, so You'd know if these 16,81m is total length or without buffers and the corridor between cars etc.
As for the wires and their appearance, please take into account, that they are 1-1,5cm thick, while 1 pixel in FD scale represents 4,5cm. Plus, these wires have attachments etc. that are missing on Your drawing.
(Most artists don't bother with drawing these wires - PomboCZ did it on occassion, but just the power, and rather as symbol, than depiction of the installation)