Yashiro Station is most likely one of the mining stations in Hinomoto.
The station seems to be a mining city, as it has a large crane and is much more industrialized than any of the known stations so far in the series; furthermore, the station also features what appears to be a mining tunnel. It was shown in episode five where we learn that the city is overrun with kabane. It is here where the crew of the train first meet the hybrid colony
Fall of Yashiro
While the station looked to be able to resist multiple attacks from normal Kabane with it's massive walls and heavily armored gates, the fused colony was able to easily scale Yashiro's walls and pour into the populated area of the bottom walls. It is very probable that the Type-48 cannon was used to surpress the fused colony for a short while, before being disabled and discovered by the crew of the Koutetsujou.
While it is unknown how the fused colony came to invade Yashiro station, it is possible that Biba Amatori unleashed the fused colony which would explain the presence of Biba's former "ear".