Built in 1892 and located at the station throat between the carriage shed and the workshops. The Points Box, as it was called locally, contained a 36-lever frame signal box was built by Dutton & Co., of Worcester, and supplied to the railway when the yard was further modified and the workshops were extended. The frame is a unique survivor of the 'drink-handle' type in which the handle of the lever also serves as the catch handle. The 'box features a set of characteristic wooden external steps that must be climbed to access the levers, with storage space beneath the timber-built top section, this would have housed all the linkage and control gear. The top section also features a three-quarter glazed section and integral fireplace, and bears a considerable resemblance to Dutton's signal boxes constructed for the Great Northern Railway (Ireland) about this time. From there the signalman on duty could command a view of the entire yard, controlling every traffic movement from passenger trains to complex shunting procedures. The one thing the signalman did not control was the staff and ticket single line safe-working, which in accordance with earlier practice remained the responsibility of the stationmaster. Douglas signal box lacked both telegraph and telephone when it was constructed, and it was not provided with a telephone until 1925 following an overrun accident in August of that year. Train to and from Peel and Castletown, and for shunting movements within the station were indicated to the signalman by a comprehensive whistle code.