Excerpts from:
http://www.nbcnewyork.com/news/local/New-York-Giants-Los-Angeles-Rams-Twickenham-Stadium-London-NYC-397307691.html
NFL Prepares for London Game Between Giants, Rams
By Zac Boyer
Twickenham Stadium has seen its share of tackles and tries, field goals and forward passes.
The NFL is about to bring some more, but with a twist.
A sporting event other than rugby will be held at the venue for the first time in its 107-year history when it hosts a game between the Los Angeles Rams and the New York Giants on Sunday.
After playing 15 games over 10 years at Wembley Stadium, the league is slightly broadening its international horizons, moving one of its annual international games to a different London location.
Even for those who have made the trek to Wembley, Sunday's game will provide a different type of atmosphere. Think of it, in American terms, as Lambeau Field meets Wrigley Field.
"Twickenham is definitely a suburban, residential venue, and so it offers a very different experience for fans," said Mark Waller, the NFL's executive vice president for international. "I think it's going to be fascinating and interesting for our fans to give us feedback on how that experience will compare to what many of them will already have seen and known at Wembley."
To prepare Twickenham for Sunday's game, the NFL and the Rugby Football Union had to make a number of significant changes.
For one, with football rosters twice the size of their rugby counterparts, the existing locker rooms will be insufficient. The Rams, the designated home team, will dress in a temporary facility in the Twickenham gym, while the Giants will utilize an adjacent reception hall.
The coaching booths, located just above the access tunnels for rugby games, will be moved to the sixth level to provide coaches with an appropriate viewpoint. Those converted suites also will need to be fitted with replay and communications systems - something the NFL and RFU have been working to install.
Some of those changes will be noticeable to longtime Twickenham attendees. In addition to the goal posts, which were installed last Monday, and the field markings, to be painted later this week, the capacity of the stadium will be reduced from 82,000 to 75,000 for NFL games.
The Rams, who flew through the night after a 31-28 road loss to the Detroit Lions, arrived in London early Monday. Per the terms of their relocation from St. Louis, they will play at least one home game in London every year until their new stadium opens in 2019.