Railway Construction, China

A lovely cover I received from China, featuring a set of train stamps issued in 2006.

All stamps are of the same value and represent the following respectively:
- the top left stamp is called "Raising Speed and Increasing Capacity"
- the top right stamp is called "Material Transportation"
- the bottom left stamp is called "Border Port Transportation"
- the bottom right stamp is called "Transportation in Agriculture"

the stamps' technical details are:

Date of issue: December 28, 2006
Size of stamps: 50 * 30 mm
Perforation: 13
Sheet composition: 16
Printing process: Photogravure

the issue also includes a souvenir sheet featuring a high-speed train, which according to some sources has been printed with a special technique which allows you, under UV lights, to see the control numbers, a map of China as well as a route map of the Chinese railway. I havent tested this in order to confirm it or deny it (need to find UV lights somewhere first), but if it is true, then that's really interesting.

Size of S/S: 127 * 76 mm
Stamp of S/S: 90 * 40 mm
Perforation: 13.5 * 13

Thanks a lot to Huang for sending these great stamps to me!