I've seen with my own eyes while traveling by train one feature about LC Gate Keepers. The Young ones wave the Green Flag vigorously since they are only into a few years of service (probably 3-4 years). The ones with 10-15 years seem to stand still with the flag. Lastly, the ones into 20+ years show the flag in a sleeping posture with heads on their arms and arms on the window sil :-D