* Change 1 Part Light Gray {2972 Train Base 6 x 34 Split-Level with Bottom Tubes (Undetermined Type) to 2972b Train Base 6 x 34 Split-Level with Bottom Tubes and Hole at Each End}
* Change 1 Part Light Gray {2972 Train Base 6 x 34 Split-Level with Bottom Tubes (Undetermined Type) to 2972b Train Base 6 x 34 Split-Level with Bottom Tubes and Hole at Each End}