in this clip early in the morning i reallised green sparks where coming off of the power lines where the train connects with them. it was very cold this day (in the negatives) so my guess to why is that the most likely frozen/iced powerlines created a lot of friction between itself and the train connectors, making it so it started giving away the copper (most likely the reason for the green collor) and giving off sparks as if someone was welding mid train ride DISCLAIMER* i am not a train expert, all assumptions made above may be fully incorrect