Optionalarrive_by?: stringSearch for journeys arriving by this time.
Optionaldepart_at?: stringSearch around this departure time; results may depart before or after it.
Optionalfirst_train_of_day?: stringSearch for the first services on this local service date.
Optionallast_train_of_day?: stringSearch for the last services on this local service date.
Exactly one selector. Timestamps require a UTC offset; service dates use Europe/London.