Logic / camera help please

Newbie here, im building a tren track and when the tren enters my tunnel i want the camera to switch to a first person tren view. Heres what iv done so far iv connected the camera to the front of the tren as 1st person view so now when i pick up and move the tren the camera moves with it, have also added a trigger zone just before tunnel and connected it to the camera thinking it would trigger camera to turn on but nothing is happening its still using default camera