[1] In May 1941 an upgraded version, the Citroën TUC replaced the TUB, but by the end of that year the last of these vans had probably been produced.

The decision had already been taken to base the new van on the running gear of the company's recently introduced front-engined front-wheel drive Citroën Traction, making it easier to meet Boulanger's brief because, without an under-floor drive shaft, the floor of the load space could be kept low.

The Citroën product development department had the first prototype running by the Autumn of 1937, and on 12 May 1939 the van was homologated for sale in the French market.

The spare wheel and battery were stored in a locker on the left side of the van, accessible from the outside but completely sealed off from the load area.

The 1,020 kg (2,249 lb) carrying capacity was a little greater than had initially been envisaged by Boulanger, which presumably led to a firming of the rear suspension settings.

In September 1939 France declared war on Germany, and on 13 February 1940 a replacement version of the van appeared, described as the 11-T série U.

The "11" in the van's name referred to its promotion to the 11CV taxation class which resulted from an increased engine size, now of 1,911 cc.

The maximum load capacity was unchanged at 1,020 kg (2,249 lb) but there were numerous detailed improvements including the fitting of a second windscreen wiper to match the one on the driver's side of the screen.

Probably only about 1,740 of the vans were produced, most of them being the earlier 1628 cc TUB version which may appear a poor return for the effort that Citroën committed to the project.