At the Severn Tunnel pumping station
The Cornish engines, provided with steam from Lancashire boilers, pumped a huge amount of water from the GWR tunnel under the River Severn. They were replaced by electric pumps in the 1960s, but the two engines have been preserved. They pumped around 13 000 000 gallons a day, mainly from springs which ran into drainage tunnels next to the 4.5 mile railway tunnels.
This particular engine at Sudbrooke drove a ventilating fan to keep the tunnel, over 4 miles in length, free of the exhaust smoke and steam from the many trains which passed through it daily. Coal trains from the South Wales collieries made up much of the traffic. The fan was 12.2 metres in diameter; electric fans now do the work of ventilation.