The 1400 class was a class of diesel locomotive built by Clyde Engineering, Granville for Queensland Railways between 1955 and 1957.

In 1955, Clyde Engineering demonstrated an Electro-Motive Diesel G12 locomotive to Queensland Railways who purchased it along with two other demonstrators under construction, and also placed an order for a further 10.

[1] When built, they were tested on standard gauge with Bo-Bo bogies, and received their A1A-A1A bogies upon arrival in Queensland.

The demonstrators differ from the production series in placement of the number boxes and marker lights on the ends of the unit.

Two have been preserved:[4] The 1450 class is a Co-Co version of the G12, lengthened on both ends to accommodate the bogies.