Wow it's so cool. So I guess the left tower lighted is not an event of the past, it will just appears differently depending on the observation frame. So let me

Wow it's so cool. So I guess the left tower lighted is not an event of the past, it will just appears differently depending on the observation frame. So let me rephrase my initial question. Why is the left tower lighted before right tower is lighted when observed from the train frame? Because the train "goes further away" from the left tower? What is "going further away" determined by? Distance delta? So, is the following correct: let two events A and B occurring respectively at positions pA and PB in the same frame, a mobile at position pM, if delta_distance(pM, pA) > delta_distance(pM, pB), then follow that observed_time(A) < observed_time(B) assuming observed_time(A) == observed_time(B) in pA and pB frame? Please note, it's not delta_position but delta_distance I've written. Also, by delta, I mean difference. (edit: I get that "distance delta" is velocity)