You watch a dull square for a long stretch. Click only when it turns pure black. Nothing else counts.
Why it is useful
Driving is hours of almost nothing, then a change that matters. Operators need people who stay on the display when there is no plot. Misses and false alarms both count. Five minutes is easy. The second half of a long run is the real test, which is why short bursts at the kitchen table do not train it.
A dark field. Click as soon as you see a bright flash or hear a beep. Ignore pale flickers.
Why it is useful
WAFV-style reaction is not a green circle. The job is spotting a real stimulus in noise: a flash, a tone, and plenty of near-misses. Clicking the flicker is as bad as missing the flash.
A target shape and colour, then a busy grid. Mark every match. Some rounds have none.
Why it is useful
Cab and lineside are busy fields. You have to see the thing that matches and ignore near-misses. Empty grids exist. Clicking because the clock is loud is a fail mode. A methodical scan beats a heroic stare.
Beeps in a pattern. Click when the count matches the number on screen. The target will change.
Why it is useful
Not everything that matters in a cab is on the glass. You have to listen, keep a rule, and ignore the rest. The trap is clicking the old target after it has changed.
A page of dot clusters. Mark every group that matches the count for that sheet, usually four. Not three. Not five.
Why it is useful
It looks like a children's puzzle. Then the clock starts. Operators care because the job is checking the same kinds of thing, again, without drifting: a dense field, a simple rule, no story to keep you awake. Rushing invents fours. Perfection finishes a third of the page. The skill is a sustainable scan.