So we don't need to know
Speed Limits
Junctions
Level crossings
Signals at Junctions and on Platforms
Line Names
up/down
Signal Boxes
Signalling Systems on each route
and a few other things that i am sure i have forgotten
10% ? I don't think so
Speed limits? All you need is the maximum line speed and not all the speeds.
Junctions - possibly if there are any on the route
Level crossings - yes
Signals at Stations - yes
Signals at junctions - no
Line names - yes
Signal boxes - yes
Signalling systems on each route - no
Now for drivers route knowledge :_
Stations
Line names
Gradients
Junction indicators
Shunt moves
All line speeds
Junction names
Level crossing names
Level crossing types
Tunnel names
Points of access
All signalling types and what they mean including shunts
Speeds at AHBC-X
Braking points/areas for stations
Braking points areas for speeds
Viaducts
Platform lengths
Stopping points on platforms
Location of facing and trailing points
Where the train can be crossed over from one line to another.
Signal types (auto, controlled, Semi, Distant etc.)
Non AWS locations
Signals that are on the off side
Signals that are high risk
Signals that are multi-SPAD
Signals poorly sighted
Unusually short signal sections
Where the signalling goes from 3 - 4 aspect and visa versa
Location and amount of signals associated with AB signal boxes.
Signal boxes that can be locked out of use.
And you need to know all this in the dark and fog, sorry no way does a guard need to know 75% of drivers' route knowledge