At some point over the last three months, DTG quietly revised the game (HUD-speeding counter) speed limit to conform to the upper (passenger/light loco) rather than the lower (freight) speed limits, in keeping with other routes. But they missed one: approaching Ellerslie eastbound, the HUD informs you that it's a 40mph zone, but the speeding counter is still using the lower limit of 25 and you get zapped.
