from_stop_id,to_stop_id,dist,from_route_id,to_route_id,elevation_gain,schedule_precedence
B2,R2,0.10,A,C,20,to
R2,B2,0.10,C,A,0,from
P1,R1,0,,,0,to
R1,P1,0,,,0,from
P2,B3,0,,,30,to
B3,P2,0,,,0,from
