In-plant piping that crosses a railroad has been the subject of much discussion over the past few years. The preamble to a June 28, 1994 federal register publication stated that in-plant piping could cross a single public thoroughfare, but that it could not cross a railroad. This position was repeated in an October 24, 1994 letter of interpretation. However, on November 18, 1998, the DOT/OPS issued a new letter of interpretation that evaluated the issue in more detail and concluded "we will consider the thoroughfare interpretation of in-plant piping system to include in-plant railroad crossings". These letters of interpretation, along with 1,200 hundred others, are available on www.DOTPipeline.org, where they can be searched by keyword. To find these letters of interpretation, search for the keyword "railroad", and select just Part 195 on the search screen. (note – we have heard from some Netscape Navigator users that they have had some problems with that site, which our webmaster is investigating.)