Steam Fp40h Boston Stoughton Traction Lock

So I set stuff up, turn those 3 diesel thingie switches on, MU valve to Lead or Dead, Cut-Off valve to cut in... brakes released... doors closed... and the traction lock icon is still on... I can move the train but... havent I forgotten sth? Or it just incorrectly shows traction lock?

 

update: I had to set the parking brake and then release it and that did it with the traction lock