"Back in my day". (Wow I sound a lot older than I am).
We trained initially for our ops training on dead track but geometrically correct.
Then when we did our actual track training, the test was "Cross that line", that line being live and in traffic hours with 12tph running on it. Then spent the next 6 or so years working adjacent to live rail basically all the time. We did have to do an "Appreciation of AC" for parallel running lines, but it pretty much stopped after the, "Don't go within 2.75m of any OLE." Until I moved employers and then did 5 different flavours of OLE training, great fun trying to remember which rules you're working under when moving between four different types of OLE across seven countries!