The LNER renumbered its locomotive stock during the period that these locomotives were being rebuilt, so some were renumbered at the time that they were rebuilt, some before rebuilding, and some after rebuilding. The renumbering plan for class B2 was the same as for class B17: in each case the first two digits were altered from 28 to 16. Thus 2803 became 1603 at rebuilding in October 1946; 2807 had already become 1607 (December 1946) prior to rebuilding in May 1947; and 2814 (rebuilt November 1946) became 1614 in December 1946. Between 1948 and 1950, British Railways increased these numbers by 60000; no. 61644 was so renumbered at the time of its rebuilding in March 1949.
Two of the locomotives were renamed. No. 1671, based at Cambridge, was the official Royal engine, used to haul specials to and from Wolferton, which was the nearest station to Sandringham; for this purpose it was renamed Royal Sovereign in April 1946. When this locomotive was unavailable, no. 61617 Ford Castle was the designated reserve, and it was the latter which was one of the locomotives used to haul the funeral train of King George VI on 11 February 1952. This locomotive was used from Wolferton as far as King's Lynn; the train was hauled from there to King's Cross by BR standard class 7 70000 Britannia. The second renaming occurred after the withdrawal of 61671 in September 1958: in October, the name Royal Sovereign was transferred to no. 61632, which then became the official Royal engine.
None of them survived the scrapyard to be preserved.
Boddy, M. G.; Brown, W. A.; Fry, E. V.; Hennigan, W.; Hoole, Ken; Manners, F.; Neve, E.; Platt, E. N. T.; Proud, P.; Yeadon, W. B. (March 1975). Fry, E. V., ed. Locomotives of the L.N.E.R., Part 2B: Tender Engines—Classes B1 to B19. Lincoln: RCTS. ISBN0-901115-73-8.