Watercress Line

Due to the COVID-19 emergency the Watercress Line Mid Hants Railway is temporarily closed to the public. The safety of our staff, volunteers and visitors is our most important consideration. You will know that the Watercress Line relies on ticket revenue to cover its operational costs, which currently work out more than £75,000 a month. Without money coming in from running services, the railway is eating into its financial reserves to survive. If you can help, please click on the Virgin Money Giving link below which allows you to donate a single amount or pay monthly if you're able to. You can also text WATERCRESS to 70085 to donate £10, texts cost £10 plus one standard rate message. Thank you for continuing to support us during this unprecedented situation. We hope to be able to welcome you back to the Watercress Line soon.

Home » Rolling Stock » Steam locomotives

30506 - SR S15 Class

Status Operational


The S15's were designed purely as a Freight engine, working the heavy night express goods trains between Exeter and Nine Elms, and from Southampton to Nine Elms.  They proved to be excellent engines.

The locomotive's chassis is currently in the back of the wheeldrop shed where the cylinders are being removed to access corrosion in the area between the main frames and the cylinders.. The new tender is virtually complete with final works being carried out this year. The boiler for 506 is now in the boiler shop at Ropley where considerable work is taking place to get it ready for fitting to the engine. It is hoped that 506 will steam again in the next 18 months if work progresses to the current plan.

Watch a short film about 499 and 506 here

Watch a short film about the Urie Locomotive Society here

For more information please visit the Urie Locomotive Society website


Built at
Eastleigh Works
Build year
October 1920
6 Freight
Entered service
October 1920
Robert Urie
Last major overhaul
Urie Locomotive Society
Shed allocation
Nine Elms (from new), Strawberry Hill 1922, Feltham 1923
Total built of class
20, 45 in total when Maunsell version added
5 January 1964


Cylinder size
21" x 28"
Driving wheel diameter
5' 7"
Max boiler pressure
180 psi
Total length
65' 6.75"
Tractive effort
28200 ibf at 85% boiler pressure
Tender coal capacity
5 tons
Tender water capacity
5000 gallons
Wheel arrangament
Working order weight
135 tons
Valve gear