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The TDD4 was a trolleybus made by Crossley between 1935 and 1942. A total of 97 built were built.

The TDD4 was a 2 axle, 4 wheel bus and the last TDD4s were built in 1942. All were fitted with double deck bodies. The TDD4 was built on a modified Mancunian bus chassis.

77 of the TDD4s had Crossley bodies using Metro-Cammell framework but the 20 supplied to Hull were by Craven.

The TDD4 was fitted with a Metropolitan-Vickers MV202FW engine which produced 85bhp. The wheelbase was 16 feet 7.5in long with semi-elliptical leaf-springs in the front and back. The differential offset to the right side of the rear axle. The bus had air pressure assisted brakes and weighed 7.5 tons (6820kg).

The TDD4 chassis was priced at £1150.

Manchester operated 64 TDD4s, Hull operated 20 TDD4s, and Ashton-under-Lyne operated 9.

Manchester withdrew their last TDD4 in September 1960

TDD6

The TDD6 was a 3 axle, 6 wheel trolley bus that was introduced in 1935 with the last one being built in 1940. A total of 17 were built.

The TDD6 was fitted with a Metropolitan-Vickers MV206A2 engine which produced 95bhp. The wheelbase was 16 feet 7.5in long with semi-elliptical leaf-springs in the front and back. The differential offset to the right side of the rear axle. The bus had air pressure assisted brakes and weighed 9.1 tons (8266kg).

16 of the TDD6s had Crossley bodies using Metro-Cammell framework, the remaining one, one of two supplied to Belfast was by Harkness.

Manchester operated 12 TDD6s, Belfast operated 2 TDD6s, and Ashton-under-Lyne operated 3.

Manchester withdrew their last TDD6 in April 1956.