Graham Farish TTA Tank Wagons By Pat Hammond The Prototype: The ‘Monobloc’ tank wagon appeared on the railways in Britain in 1958 and was based on a French design. By lowering the tank between the solebars the centre of gravity was also lowered, thus allowing the accommodation of a larger tank. Wing plates welded to the solebars hold the tank in place. Following agreements between British Railways and the petroleum industry in 1963, regarding the transportation of petroleum products by rail, there was a massive increase in the building of new tank wagons to form block trains and the ‘Monobloc’ was the principal design adopted. The Model: The original Graham Farish N gauge range did not include a cylindrical bodied petroleum tank wagon, only the flat tar wagon. The N gauge ‘Monobloc’ TTA tank wagon was introduced by Bachmann in 2007 and since then over 30 examples have been released. Bachmann have recently released two new versions of their Graham Farish model, each with a recommended retail price of £17.95. These are: • 373-777D weathered and distressed ‘Shell/BP’ No.67034 in pale grey livery (era 7). • 373-780 ‘Total’ No.PR58236 in pale grey livery (era 8).