 The line was thus divided into three blocks, each roughly 2 miles (c 3.1 km) long; entry to each block was controlled by the signal box at the start of the block.Shunting into the siding at Abbots Ripton took place in a fourth block.The 'home' signals at Abbots Ripton were interlocked with the siding points, so that whenever the points were open to the main line the Abbots Ripton home signal lever had to be at 'danger'.