LEGO Dark Stone Gray Train Base 6 x 34 Split-Level with Bottom Tubes and 1 Hole on each end (2972)

LEGO Dark Stone Gray Train Base 6 x 34 Split-Level with Bottom Tubes and 1 Hole on each end has been used in at least 2 LEGO sets over the past 16 years, since it was first used in 2008. You can also find this part in at least 10 other colors. It has a design ID of 2972 which can usually be found molded into the bottom of the part.