The TDD6 3 axle, 6 wheel, trolley buses were introduced in 1935 and the TDD4 2 axle, 4 wheel, model in 1936. The last TDD6s were built in 1940 and TDD4s in 1942.
All were fitted with double deck bodies. The TDD4 was built on a modified Mancunian bus chassis.
Chassis numbers were:
92301 to 92317 - TDD6. 17 built.
92401 to 92497 -TDD4. 97 built
A Manchester Corporation Crossley bodied TDD4
The Crossley bodied TDD6 supplied to Belfast.
The trolley buses were supplied to the following operators-
77 of the TDD4s had Crossley bodies using Metro-Cammell framework but the 20 supplied to Hull were by Craven.
16 of the TDD6s had Crossley bodies using Metro-Cammell framework, the remaining one, one of two supplied to Belfast, was by Harkness.
The TDD4 chassis was priced at £1150.
Manchester withdrew their last TDD4 in September 1960 and their last TDD6 in April 1956.
MV202FW (TDD4) or MV206A2 (TDD6)
|motor output||85 hp (TDD4)
95 hp (TDD6)
|Overhead line voltage||550 v dc|
|max speed (approx)||n/a|
|Rear axle||differential offset to off side (right)|
|wheelbase||16 feet 7½ inches (5.067 m)|
|length||27 feet 6 inches (8.382 m)|
|width overall||7 feet 6 inches (2.286 m)|
|weight|| 7 tons 1036 pounds (7128 kg) (TDD4)
9 tons 224 pounds (9246 kg) (TDD6)
|steering||cam and lever|
|suspension - front||semi elliptic springs|
|suspension -rear||semi elliptic springs|
|brakes||Air pressure assisted|