The British Transport Commission and BR management therefore decided to expand the pilot scheme to hasten the introduction of modern traction. In May 1957 – a month before the first locomotive ordered under the original pilot scheme (the first of the English Electric Type 1s) entered service – the total orders were increased to 230 and the power categories were expanded from three to five, introducing new mid- and high-power types that BR had not originally considered necessary. In late 1958, as BR's financial balance approached an annual loss of £100 million and still well before many of the locomotives ordered in 1955 under the original pilot scheme had been built, the BTC agreed to further accelerate the adoption of diesel traction by placing sufficient orders to introduce 2300 diesel locomotives by the end of 1963. Although some designs were not perpetuated in these bulk orders on the basis of the early experience with the pilot scheme, many of the types included in these orders had not yet entered full service and in some cases the prototype had yet to be built. Designs for the new Type 3 power rating – not present in the pilot scheme – were ordered in quantity 'off the drawing board' and only one Type 5 design was in existence (the production version of the DP1 prototype, the existence of which actually predated both the Modernisation Plan and the pilot scheme, even though it was not included in either).