I think that Suburban Map is an excellent representation of how it was and displayed on Maps of the Day.
As a child, we went to Katoomba often before moving there in 1954 and it was Steam past Parramatta.
For many years you could see by the style of the stanchions where it originally finished and the 'New' began.
Obviously the Electrification must have started at least in 1950 due to the amount of work involved.
I really dont remember seeing the 46 class until the overhead was 'livened' to Katoomba and then the 46's were used as the Pilot from Valley Heights to Katoomba and didnt they make a difference !!!
For those not versed in Imperial measure, there are 100 'Links' in Chain and 80 Chains (22 Yards/66 feet) in a Mile.
For visual reference, a Cricket Pitch is one Chain.
Along the track were concrete monuments with the chain/link plus a mark for the Fettlers to use for Track measurements.
Where it was not possible to put a 'monument' in the ground, this was done along the platform edge.
There was also the Mile, quarter, half and three quarter posts as opposed to the Kilometre and half Kilometre used today.
Today the Overhead stanchions are marked in Metres which is so much easier to read than in feet as they were back then.
1764 Yards or 5192 feet.
Could you imagine if the O/Head went to Perth, you'd be pushing to find enough space on the Mast to write in the distance..............