Big Little Lies spent $30,000 on the train set in this week's episode

Vulture

“The train was something added by David Kelley, because he wanted this guy to have a man cave,” production designer John Paino told Vulture of the train set belonging to Gordon Klein. “When I was researching man caves, it made sense that he had a train and enjoyed collecting memorabilia. We wanted to have a really expensive train set in there to show his wealth. What would be something expensive he could lose?”