The discussion explores the implications of performing the double slit experiment on a moving train, focusing on the concept of simultaneity in different frames of reference. The original poster questions whether the speed of light being constant for all observers would lead to contradictions in the experiment's results, particularly regarding the detection of a photon by observers on the train and platform. Participants clarify that simultaneity is frame-dependent, emphasizing that events perceived as simultaneous by one observer may not be by another, thus negating the possibility of contradictions in outcomes. They also note that the interference pattern in the double slit experiment is independent of the observer's frame of reference, and the collapse of the wave function is not essential for understanding interference. The conversation encourages a simplification of concepts to better grasp the relationship between special relativity and quantum mechanics.