I have a game on going that I have saved to come back later to, but there is a triangle passenger that refuses to leave the station. Its the square station that I add the brown line to close to the center of the map
Here are three screen shots
Second where I draw a direct line
Third see the passengers it picked up and left behind
I have not finished this game yet but the same triangle is still there no matter the option to be picked up on any line.