On 13 March 1971, Michael also informs me, London Transport withdrew from passenger service its last bus equipped with a roof-mounted route number box, a.k.a. 'roof box', 'top box' or 'lighthouse'. This item had been a feature of London bus design for over 40 years and had been incorporated on London General/London Transport buses within classes LT, RT, RTL, ST, STD and STL, while some bodies built by Birch and Dodson for London independents also had this feature.
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