Does anybody know the part number of this tile? Does anybody know the part number of this tile? The size is 2x14. 
It has an unusual height. It's higher than 1 plate, lower than 2, so it's an exact 1/2 of a brick. See the given picture for the bottom:
That's Train Level Crossing Center Rail Cap Insert 2 x 14 x 2/3. Although as naming suggests it is 2/3 of a brick, so it must be two plates high.

Picture from Bricklink:



And here is a list of 6 sets it was part of.