Two, 1H-series D8's from the WW2 era. The one to the left has had a fancy "hardnose" installed, so it could carry a cable blade without needing the overhead framework, that was usually used for blade lift mechanisms on Cats in this era. The one on the right is being erroneously described as a 1944, "RD-8". The year of build may be correct, but the last "RD-8" was built around August-Sept 1937. From that date on, they were merely known as the Caterpillar "D8".