Cowford wrote:And that's more than anyone here probably wanted to know!Nope.
And we're now seeing the continuing evolution of low profile fittings/manways. The drains are surrounded with I beams at 45 degree angles to stop a tank on an off the rails rampage from breaking the downpipe off. The tops have similar protections and ever decreasing profiles. All in an effort to minimize risk to the most exposed part of a tank car.
While cars stacking up at 60, or even 30 might still crack open cars, these protections have proven their value in places like the rollover in Mattawamkeag 2 years ago. Working exactly as designed to keep openings from breaking.