imbalance of the large drivetrain could only be compensated at one speed. Classes Climaxes were built in three distinct classes: Class A These featured a steam engine unit with two vertical cylinders mounted in the center of the locomotive. Class A Climaxes had a frame similar to a flatcar with wooden boxcar-like bodywork built up above it to protect the crew and fuel from the elements—this could be more or less covering between locomotive to locomotive. The front half of the locomotive, in front of the engine unit, contained the boiler. In smaller examples this may have been a vertical boiler, while in larger ones a tee boiler was employed. Class A Climaxes were small locomotives, generally under seventeen tons. Class A Climaxes, unlike Heisler and Shay locomotives, had two-speed gearboxes. Class B Introduced in 1893, the Climax Class B was looking more like a conventional steam locomotive. It had the cylinders either side of the boiler, permitting it to be longer and larger than possible with the Class A arrangement. The two cylinders drove a transverse shaft that was geared to the longitudinal driveshaft in the middle; on early Class B climaxes, the cylinders were horizontal and pointing forwards, while later ones had the cylinders angled upwards at about 30 degrees from horizontal. Class B Climaxes weighed approximately 17 tons at minimum to a maximum of approximately 60 tons. Class C A class C was a three-truck design, the additional powered truck being beneath a water-carrying tender articulated to the locomotive. This allowed the locomotive to operate for longer periods of time before needing to stop for water. All Class C locomotives had inclined cylinders. Survivors Approximately 17 Climax locomotives survive in North America, of which about five are operational. Two survive in Australia: No. 1694, restored and operational since 8 September 2013, at the Puffing Billy Railway, in Belgrave, and No. 1653, on display at Hobart, Tasmania. The New Zealand Climaxes are No. 522, stored at Tokomaru, No. 1203, stored in Shantytown Heritage Park near Greymouth, No. 1317, under static restoration at Te Awamutu, and No. 1650, as of 2013 under restoration at Pukemiro. Hence, four of the seven Climax locos delivered to New Zealand have survived. The Climax locomotive No. 9 at the Cass Scenic Railroad State Park in West Virginia is operational, used alongside the Shays to power the regular excursions up Cheat Mountain from May