boarding transactions
I would choose a description like this so that aggregated numbers as below could be called ridership


ridership transactions
(good search term to find transit sites, but ridership often refers to a more aggregated term.)

examples of usage:
http://www.caltrain.com/caltrain_ridership.html
Caltrain does an extensive ridership count once a year. The below table contains the average number of weekday riders who boarded at each station in February 2004. Our next ridership count will take place in October 2004.

http://www.straphangers.org/howsmybus.html
Bus Service Lags Behind Gains in Ridership, ...

http://www.washingtonpost.com/wp-dyn/articles/A9933-2004Sep9...
Average weekday ridership was 652,578 on the trains and 502,971 on the buses.



Since this is transportation data and this is a transaction level table, I would use some description specific to the context