“Officers were called to the scene at 9.43am and remain there alongside paramedics and firefighters,” BTP wrote.
The leak is an “extremely serious incident,” First Minister Nicola Sturgeon tweeted. “I have had an initial report from the Network and emergency services and I am being updated. All my thoughts are with those involved.”
A spokesman for the hospital dealing with the victims said it was “on the verge of major incidents”;.
The photos show that there were at least six ambulance vehicles, an air ambulance and a number of police cars in the country, reports the PA Media news agency.
Video from the scene showed the smoke billowing in the background.
Railway Maintenance Authority NetworkRail Scotland said it was working with emergency services.
British Transport Secretary Grant Shapps said he had an urgent meeting with the Grid Network about the incident.