I live in New Jersey and would normally drive into NYC to purchase chemicals at BHPhoto rather than paying shipping for heavy liquids. To make these trips worthwhile I would purchase a couple of gallons of whatever I needed. The trip into New York can depending on traffic be a pleasant (???) run or a nightmare. So I got to thinking about taking the train into the city. That caused an alarm to go off in my head and I decided to contact NJ Transit to see if there were any regulations about transporting photographic chemicals on a public train. The last thing I wanted was to show up carrying bags of chemicals and be denied boarding or worst. I provided a list of the chemicals I would would normally purchase and received the following answer. I could transport a maximum of 2 gallons each of the following: DDX, Silvergrain Clearwash, Hypam Fixer, Harman Toner Selenium. Could not transport Rodinal due to it's hazard level. Please note these are the chemicals that I use and the approved or disapproved list is probably more extensive. I was interested in those listed. I had to provide the Hazmat Police unit with the MSDA sheets for each of the chemicals. They are concerned with leaks that may develop and what is involved in clean up. Also, potential fumes and skin contact. They thanked me for following "proper protocol in regards to seeking permission for the transportation of photographic chemicals". So there are apparently rules that are not made public unless you ask. Yeah, I know I could have showed up and got on the train and maybe made it to my stop with no problem. On the other hand I could have ended up as an item on the News at Six program. You may want to keep my experience in mind if you are using public transportation when you purchase chemicals where ever you live. If they have such regulations in New Jersey, they probably exist where you live. While the train would be more convenient I will probably drive in and really stock up.