In the first episode of the new anime "Koutetsujou-no-Kabaneri", the first train had to stop before they let it enter the station. (which can be seen in the following picture)
Why was the bridge already down before the second train even arrived? This made it easy for the Kabane to invade the station. (here you can see that the bridge was already down before the train even arrived)
Was this an error? Or is it a part of the plot, to let the Kabane enter the station?