Signalling
The line is double tracked except between Littleport and Downham Market and between Watlington and King's Lynn where it is bi-directionally signalled single track. In the Down direction, the entrance to the single line sections is protected additionally by SPAD indicators.
Signal boxes controlling the line are;
- Cambridge power box
- Littleport
- Downham Market
- Magdalen Road (Watlington)
- King's Lynn
The signalling system is Track circuit block with multiple aspect colour light signals- with the exception of:
- one semaphore signal at King's Lynn which controls entry to the One Train In Section freight-only line from King's Lynn to Middleton Towers
- two semaphore shunt signals at Downham Market station
Read more about this topic: Fen Line