Use 2 engines, 6 box cars, and one tank car.
When the train stops at the station, the tank car is not "in the zone" and the pumps will not connect.
If you back up 1 tile away from the station, the pumps will connect.
*note* As I built the train with the first engine snapped to the station, the last couple cars want to snap to the rail segment, but then jump to connect to the train when placed, about 1 tile away. Up to that point every car seems to snap to the rail and train correctly.
Uhhh... ya... the blueprint with the train in it.
