The incident happened near Cottingley Station at 1pm today.
British Transport Police are at the scene along with paramedics. They said:-
"The woman has been taken to Leeds General Infirmary with injuries that are serious but not life-threatening.
"The incident is not being treated as suspicious."
Two trains are said to be at a standstill on the tracks near Churwell Hill and the air ambulance has landed nearby.
Northern Rail have Tweeted that all lines between Leeds and Sowerby Bridge are blocked.