The three Diesels who will mark their proper introductions to the TV Series in the above mentioned special can be seen as wooden models via TTTE Wikia.
However, it should be worth noting that the models seen in the three images are not in their finalised forms and are currently shown as low-resoultion 3D models.
The Wooden Railway models of Norman, Sidney and Paxton will be released later this year tieing in with Day of the Diesels which premieres in the Vue Leicester Sqaure Cinema on September 17th.
VIEW THE IMAGES
Thanks to ClearwaterMK2 for the alert.