Days run
Also: days, runs on, weekdays
Seven ones and zeros that say which days of the week a schedule runs.
Example
11111
0
0
A schedule has a date range and a list of days. The days are written as seven digits, Monday first: 1 if it runs, 0 if it doesn’t.
So a weekday-only train is 1111100. To know if it runs on a particular date, the date has to be in its range, on one of its days, and not cancelled by a short-term change.