The Pennsylvania Railroad was noted for its unique structures and the Walthers Cornerstone HO Scale PRR Block and Interlocking Station captures the family look of the railroad's buildings to a tee. On the Pennsy brick towers were used along the line at busy junctions, interlockings and other block stations. Inside operators shepherded trains through complex trackwork by lining signals and turnouts.

These towers were used on railroads affiliated with the Pennsy, successors Penn Central and Amtrak and are extremely similar to towers on other railroads. A few have been preserved by historical groups in the modern era. The PRR Block and Interlocking Station kit features correct Flemish Bond brick walls, concrete foundation and a realistic operator's bay.