LEGO Transparent Light Blue Glass for Train Front 2 x 6 x 2 (17457 / 47490)

LEGO Transparent Light Blue Glass for Train Front 2 x 6 x 2 has been used in at least 4 LEGO sets over the past 10 years, since it was first used in 2014. You can also find this part in at least 3 other colors. It has a design ID of 17457 which can usually be found molded into the bottom of the part.