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They likely counted the number of passengers via turnstiles or a gate or something. Think passenger count would be a good indicator of expected revenue and there would be a pretty clear gap. Probably one of the things the auditors noticed that was explained away by buggy code.

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Unfortunately in Edmonton, the LRT is largely on the honour system. There are no fare gates, turnstiles, etc, to derive an accurate count from. Any passenger counts presumably come from statistical sampling or from checking fares as they exit the system (this is an occasional enforcement activity, not an everyday occurrence).

There is a pilot project[0] to put turnstiles/gates at two stations, but this is to keep the homeless out of the stations, not to count passengers.

[0] https://www.cbc.ca/news/canada/edmonton/transit-turnstiles-o...

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