Working memory tests for train drivers

Some of the battery is not a search page. You hold a short string, a path, or a list, then the next item arrives before you have finished with the last one. That is working memory. It shows up as digit span, n-back, a sequence of blocks, or a list you hear once.

It is closer to keeping a headcode or a message than to a quiz about railways. Guessing is expensive. On some versions one miss ends the run.

What the wrappers look like

• Digit span: a short sequence, then one extra digit each time you clear a level.
• N-back: a stream of letters. Was this one the same as two ago?
• Block sequences: watch a path flash, then click it back. Spatial, not digits.
• A spoken or written list you hear once, then a question with the page gone.

Employers mix these. Your invite may name one and not the others. Practice is so the shape is not a stranger. It is not so you can argue that the official version used different letters.

How people fail them

They rehearse out loud, then freeze when that is not allowed. They chunk the easy early levels and fall off the moment the string is one item longer than comfortable. They click the path they meant to remember, not the one that actually flashed.

Rehearsal in your head is the job. Writing it down is not. If a version ends on the first miss, a confident guess is still a miss.

How to practise

• Sit the wrapper you have not seen. The first time you meet n-back should not be on the day.
• Do not only sit the length you can already hold. The useful run is the one that just overflows.
• If one miss ends it, treat that as part of the format. Restarting is practice, not a pass.

A score here is a training signal. It is not a prediction of the official cut. Hold the list. Then let the next item arrive.