Here;s a little information on the tank car GATX 95' 39134:102438, that I built, this copied from the description.
Tank Car GATX 8 Axel 95Ft., 96' 7 5/8' total length, industry enabled with operating hatchs and loading pipe with dust effects, ARN (auto run numbers) and 4 LOD (levels of detail). Built by General American Transportaion Corporation in 1965. Number 96500 is the worlds largest tank car. Used for experimental purposes, transporting anhydrous ammonia and LP gas. This Whale Belly unit carried 60200 gallons and weighed 220 tons fully loaded. The Association of American Railroads has since adopted a maximum length not to exceed 89'.