5531 see here at Southall is in its final year of service and was one of the last four of her class to remain in action , being withdrawn that year in company with her sisters 5508 , 5564 and 5569 .
Built at Swindon in 1928 , one of the final and sixth batch of seventy five , the engine displays her later style of 1300 gallon water tank , the original examples of the class having a capacity of 1000 gallons , and had been a Plymouth Laira engine some years previously .