The extra low overall height design was achieved by using an upper deck sunken gangway on the off side with four across bench seating. The lower deck also featured a centre gangway which was slightly recessed between the chassis frames. However this design was less than ideal, with unsuspecting lower deck passengers in danger of receiving a painful reminder of the intruding gangway over the off side seats.

By 1929 vehicles were being built with Leyland's less draughty enclosed staircase body, and this soon became the standard for the type. The TD1 chassis was also available to a wide variety of other bodybuilders who fitted their own distinctive designs of body.

Although the TD1 version only remained in production until 1931, it was the first of a long line of Titan models. The last TD7 was built in 1942, but the Titan PD series which followed, continued in production in various versions until 1968.

THE EFE MODELS
Currently the oldest double deck type represented in the range, the Leyland Titan TD1 models are currently available in three versions.

The open staircase version first appeared in February 2000 followed in January 2001 by the enclosed staircase model. Finally in September 2003 a third version with enclosed staircase and high piano front was added to the range.
The most recent version resembles more closely the vehicles operated by some larger operators, such as Southdown.

The TD1's were the first double deck models to include starting handles and interior lower deck ceiling detailing.

Several models have been released in the themed War Time Buses & Gilbow Railway Collection series and have been allocated catalogue numbers in the 992xx & 996xx range as a result.

The TD1 has also been released in the liveries of several Australian operators, these being commissioned by Trax, and released in there Trux commercial vehicle range in Austalia. These models were also made available to EFE subscribtion Service members in limited numbers.