from_stop_id,to_stop_id,transfer_type,min_transfer_time
4_01,4_01,,
2_01,2_01,,
1_01,1_02,,
1_01,1_03,,
1_02,1_01,,
1_02,1_03,,
1_03,1_02,,
1_03,1_03,,
51_01,51_01,,
42_01,42_01,,
18_01,18_02,,
