There is a cycle of maintenance. Certain things will be checked after X time and/or Y distance. Different things will be checked after every 3X or 3Y, 10X or 10Y and so on for higher order issues. Then there will be more serious depot level inspections in a monthly / quarterly / annual / 5-annual cycle. Incidents or particularly harsh operating conditions may see those time periods speeded up, e.g. the cold weather the last two years say toilet systems freezing. It would have been prudent to check those systems more regularly during and after that weather.0
I imagine drivers are meant to check certain basic things everytime the loco / train is started.
I imagine sets will get a walk through once a day, with fueling and possibly lubricant added, but they can generally survive a few days before gettting back to base before issues start happening.
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