The tender pictured with 502? was one of a pair, numbered 407 and 408, built at Inchicore with locomotives 501 & 502 in February and March 1926.
They were ordered by the GS&WR but the order was completed by the GSR.
They were nicknamed "Biscuit tins" as the coal was contained within a steel plate hopper, set back from the tender outside plating ( to aid sighting lines by the footplate crew ) and the tender did not have coal rails like many other tenders.
Water capacity was the second largest on the GSR at 4670 gallons, coal carried was 7 tons 10 cwt, tare weight 49 tons. ( the three 800 class tenders had 5000 gallons and 8 tons of coal.)
The ladder with the curved handrail top on the tender rear remains from the time that the three 500's were converted to oil firing for a brief period 1947-48