Estimated date, but the class was rebuilt from Billington Class L 4-6-4T between 1934 and 1936, this one was being photographed at Eastleigh on 23/11/35 before being released to traffic. The resignalling at Waterloo was carried out throughout 1936 and was completed on the night of 17/18 October. Nigels best guess would be sometime between May and October - the resignalling at Waterloo itself appears to have begun with alterations to the layout of platforms 1-6 between 8-17 May, but the RO, which carried fairly extensive reports of the work throughout the year, states that manual working from A and B boxes was still in force after the latter date'with semaphore signals (altered as necessary)" - there are, of course, crosses on the uppermost arms visible behind the loco, suggesting that these were signals yet to be brought into use - if they'd already been taken out of use the arms would simply have been removed. Thanks to Nigel Wassell for all this fascinating information.