Appleby Signal Box Approximately 10 Metres North West of Level Crossing

Railway signal box, dating from the late 19th century and originally built for the Manchester, Sheffield and Lincolnshire Railway Company, by the Railway Signal Company of Fazakerley, Liverpool. The building is timber-framed, with weatherboard cladding and a Welsh slate roof. Inside is a cast-iron lever frame. The signal box is rectangular in plan and located approximately 10 metres north-west of a level crossing.

The south front, which faces the railway, is two storeys high and two bays wide. The ground floor has two two-pane casement windows with sills. The first floor has a plank walkway supported on cast-iron brackets, with an iron handrail beneath a full-width window. The central section of this window contains 24 panes, with four-pane sliding sashes at each end. A cast-iron gutter runs along the roofline. The swept roof has ornate bargeboards and wooden finials. A rear chimney is made of iron.

The west return features a board door to the right and a wooden staircase with plain treads, a newel post, and a handrail, leading to a landing supported on cast-iron brackets. An enclosed lean-to porch has an outer glazed door and a half-glazed inner door. The first floor has a hinged plank walkway, a full-width window with glazing bars incorporating sliding sashes, and a four-pane attic casement. The right return has a similar plank walkway, first-floor window, and attic window. An original nameboard with raised lettering reads "APPLEBY LINCS." The rear of the building has a four-pane casement window overlooking the road.

Inside, the original 23-lever frame, bearing the manufacturer's name, is located on the first floor. A mechanism for operating level crossing gates, manufactured by the Westinghouse Brake and Signal Company and bearing the inscription “LNER 1942," is also present. The signal box is notable as a representative example of a standard design (used between 1881 and 1923) from a leading signalling firm of the pre-grouping period, and is listed together with the nearby Elsham Signal Box, located approximately 5 miles to the south-east.