According to both Railnews and Railway Gazette International RIA issued a statement yesterday on the back of the Article 50 activation:
"Brexit presents the industry with both challenges and opportunities’, said Chief Executive Darren Caplan. "The Railway Industry Association will seek to be specifically included in any Brexit agreement negotiated, ensuring UK railways sit alongside automotive and aerospace as one of the Department for Exiting the EU’s top transport sectors.
"Additionally, we will work with the UK government to maintain trade in as frictionless a manner as possible, for example on standards and tariffs; and we will seek to ensure our industry continues to have access to an adequate supply of skilled labour from the UK and around the world, regardless of the outcome of these negotiations."
Although perhaps a shame that you can't yet find it on the news section of the RIA website...