thumb|[[GWR 4300 Class 5322, preserved in ROD khaki livery]]
The Railway Operating Division (ROD) was a division of the Royal Engineers formed in 1915 to operate railways in the many theatres of the First World War. It was largely composed of railway employees and operated both standard gauge and narrow gauge railways.
The ROD operated their first line on a section of the Hazebrouck–Ypres line. The work was carried out by former employees of the London and North Western Railway.
Railway Construction Companies
A number of Railway Construction Companies existed during the great war. The companies built standard gauge railways in combat zones on multiple fronts during the war. At the start of the First World War there were two regular and three special reserve, these were:
- 8th Railway Company
- 10th Railway Company
- Depot Company
- Royal Anglesey (1 company)
- Royal Monmouthshire (1 company)
It was soon realised the importance of railways on the front line, several more companies were raised for the duration of the war. The last company was demobilised in 1919.
Great War companies included: