What might be evaluated to compare the effectiveness of cleaning at different stations?

Evaluating the visual cleanliness of surfaces provides a direct measure of how effectively the cleaning protocols are being implemented at different stations. Cleanliness can significantly impact passenger perception and satisfaction, as well as overall safety and health standards. A visual assessment allows for an immediate understanding of the environment's hygiene levels, making it a practical parameter for comparison.

Other aspects, such as maintenance records or the frequency of accidents, do not directly measure the effectiveness of cleaning. Maintenance records may offer insights into equipment functionality but would not indicate the cleanliness level itself. Similarly, the number of cleaning staff available could determine the capacity for cleaning tasks but does not directly assess the quality of cleaning performed. Thus, the visual cleanliness of surfaces is the most relevant and straightforward metric for evaluating cleaning effectiveness across different stations.