Tank car buffer cars

[Green_Elite_Cab]

Here is a page out of an old Conrail Hazardous Materials book. I'm sure there are finer restrictions, but this seems to cover the basics.

You may need to click the magnifying glass in the upper left of the picture to get a bigger version. remember to click the magnifier a second time to get the full size shot in the mini window. All the text was legible when I checked it.