A couple from the archives of 1933. The New Stanmore Branch was top of the bill in April with a Met. Pullman car on the opening train.
O.S. Nock gives a State-of-the-Nation address for the Underground as of that year. Interesting map with build dates and Holborn reconstructions. Wonderful map on p. 25 - South Acton connections and lines to Grove Road (long gone). Also the possible future coal-line connection (Piccaddily to Gunnersbury) utilising the second, eastern arch under the westbound lines.
Before and after photographs on the new Cockfosters extension. Check the oak tree's branches - it is the same one! (p. 26). This last one's a bit of a big one I'm afraid (4.5 MB).
Thanks Hutch very nice. Would be interested in more on the diversion of Wealdstone Brook and new underbridges though.
RE: Stanmore Branch
Of the description of new bridges I'm guessing that the "accommodation bridge" alludes to the structure at Kingsbury? There is a concrete overline footbridge at Canons Park (the park itself) though it may be a later construction.
Also what is "Steelcrete" in the context of the paper? Holden was quite fond of steel sections encased in concrete though the architects for Stanmore and Kingsbury is WA Clark I believe.