When Mannix and Elena escape it is apparently supposed to be nighttime -- lights inside the house are visible, the porch light is on, the jeep's headlights are on, and the dialogue suggests it is night. But the scenery outside is very brightly lighted, too light for even full moonlight.
Mannix and Elana were chasing the moving train from its right side by the camera in the train. When they came close to the train by the ground camera, they approach from its left side.