doors and headcode discs in favour of a central roller blind headcode box. The livery also changed to two tone green with grey roof similar to that of the British Rail Class 55s so they looked every bit a 'Baby Deltic'. The locomotives gradually returned to traffic and became very reliable in traffic except for continuing coolant system problems. The allocation of all ten locomotives in October 1967 was Finsbury Park. Withdrawal By the late 1960s BR had drawn up a "National Traction Plan", whose aim was to rationalise the number and types of diesel locomotives in traffic (and thus reduce operating costs). The 'Baby Deltics' were an obvious target, being only a ten-strong class, and still beset with operational problems. The locos were withdrawn between 1968 and 1971. The last two locos in traffic on revenue-earning service were D5905 and D5909. Several of the class received full yellow ends whilst still in two-tone green. These were D5900/3/4/8; D5908 also carried the new double-arrow BR symbol. D5909 was the only locomotive to receive the full "rail blue" livery. D5901 was transferred to the departmental fleet of the Railway Technical Centre in 1969. It worked test trains to and from the RTC until 1975, when it was replaced by a Class 24. The loco was cut up in 1977, still carrying two-tone green livery with a grey roof and small yellow warning panel. Preservation The only major component of a Baby Deltic to survive (apart from works plates) is Napier T9-29 engine No. 388 along with its main and auxiliary generators. It had been stored at Stratford TMD being retained as a spare for D5901 whilst it continued in service at the RTC. After D5901 was finally withdrawn the decision was taken to transfer the engine to the National Railway Museum in York. In 2001 the engine was purchased by the Baby Deltic Project and restored to operational condition in 2008. The Baby Deltic Project purchased Class 37 No. 37372, into which the engine was temporarily fitted whilst undergoing running tests. A photograph of the engine being started has been published in Rail Express magazine, and videos of the event are available online. The T9-29 engine is currently in store at Barrow Hill Roundhouse near Chesterfield (and not on public display) whilst the Baby Deltic Project completes modification work to the locomotive. On 5 September 2010, the Baby Deltic Project announced