Ab class steam locomotive, NZR no 661 (4-6-2), fitted with a Pearson's superheater and tandem compound WHB pump, photographed on 15 March 1923 by A P Godber.
Godber, Albert Percy, 1875-1949
<a rel="nofollow" class="external free" href="https://tiaki.natlib.govt.nz/#details=ecatalogue.191927">https://tiaki.natlib.govt.nz/#details=ecatalogue.191927</a>