At the turn of the 20th Century, suburban rail traffic into Birmingham was growing rapidly. The Great Western Railway greatly expanded their facilities in the city at that time to cope with the demands. Snow Hill station, their main station in Birmingham, was extensively rebuilt and expanded. However, the twin tracked Snow Hill tunnel, which ran underneath the city centre into Snow Hill from the south, did not have enough capacity to accommodate all of the traffic, and widening the tunnel was considered impractical. In order to solve the capacity problem therefore, Moor Street station was built at the opposite end of the tunnel to take terminating local trains from the south and relieve traffic.