from_stop_id,to_stop_id,transfer_type,min_transfer_time
23911_01,23911_01,0,
23911_01,23911_02,0,
23911_02,23911_01,0,
23911_02,23911_02,0,
23907_02,23907_02,0,
23907_02,23907_03,0,
23907_02,23907_04,0,
23907_03,23907_02,0,
23907_03,23907_03,0,
23907_03,23907_04,0,
23907_04,23907_02,0,
23907_04,23907_03,0,
23907_04,23907_04,0,
