Journey: product_at is an explicit function, not an implicit accessor

	qw(datetime sched_datetime rt_datetime tz_offset

	  is_additional is_cancelled is_partially_cancelled

	  station station_eva platform sched_platform rt_platform operator

	  product product_at

	  product

	  id name type type_long class number line line_no load delay

	  route_end route_start origin destination direction)

);