The Standard tube stock dates back to the 1920s. It was a series of tube stocks which were designed to be cross-compatable. The first was the 1923 prototype stock. That and the subsequent stocks produced through to 1930 were intended for operation on the Edgeware, Highgate and Morden (now called Northern), Bakerloo and Piccadilly lines. The 1931 and '34 stocks were built additionally for the Piccadilly line extension.
The cars were built by Metro-Cammell, Cammell-Laird, UCC (Feltham) and BRCW. They enabled a multi-line standardisation of stock to simplify matters of operation and maintenance. As with all Underground trains, they run on the 630v fourth rail system.
My model is based on the early 1923/25 stocks, utilising the early livery - which happens to be my favourite. As with my other tube stock models the motor is hidden beneath a skirt . The blank section behind the cab on the driving motor cars is where the control and switching gear was located, in all subsequent stocks this was relocated to the chassis as the equipment became more compact. The upswept frame beneath the control gear was because the driving bogie there had 3ft wheels, as opposed to the 2ft8 ones characteristic of tube stocks.
The Standard stock does have a clerestory roof, but at this scale it is impossible to do, so I have used ordinary slope bricks. The cab windscreens are SNOT and are braced behind the communicating door. I have used selective compression to my ordinary system for tube stock models, to maximise performance on Lego track geometry. The cars are joined by tow-balls and -sockets which makes the cars appear more semi-permanently coupled and realistically spaced apart.
This model was first displayed at the Brickish Association 2007 AGM and has since been displayed at Petersfield Lego Show and Merrist Wood and Twyford Lego displays.