The "Overchurch" contained identical engines to "Mountwood" and "Woodchuch", however, with a gross tonnage of 468, the ship was slightly heavier than its two near sisters."Overchurch" was fitted with a small deck area just behind the bridge and around the rakish funnel. The funnel was joined to the bridge at the front and was quite high, giving the ferry a top heavy look. There were also sheltering bulkheads beneath the bridge wings. When built, she was somewhat more advanced than the two sisters. Her wheelhouse generally offered a more pleasant working environment for her crews as they did not need to venture outside when berthing the vessel in order to reach the bridge wing, as they did on the slightly older "Mountwood" and "Woodchurch".