REFERENCE
The durable core — public-source rail facts. Decode a car the moment you see it.
What does a commodity typically move in? Descriptive reference only — not shipping advice.
For bulk liquid & dry-bulk cars — does a product fill the car's volume first (cube out) or hit the weight limit first (weigh out)?
Open calculator →AAR mechanical categories — typical specs and the commodities each carries.
…or browse all below.