Museum of Modern Art. It's titled Medusa's Head, and it's the work of the sculptor Chris Burden, who passed away last May.
We'll never know what prompted him to incorporate model railroad equipment into this sculpture. He was also fond of incorporating Meccano and Erector Set parts into his sculptures. Needless to say, it's not an operating layout. Perhaps a more suitable title would've been "Meltdown at the Gateway after the DCC went haywire".