All the Toukaido bullet trains, Nozomi, have 16 cars, and the cars 1 through 3 in the direction of Shin-Osaka are for non-reserved seats.
ご質問ありがとうございます。
"All the Toukaido bullet trains, Nozomi, have 16 cars,"=「東海道新幹線のぞみの全ては、16両編成です」
"and the cars 1 through 3 in the direction of Shin-Osaka are for non-reserved seats."=「そして、新大阪寄りの1号車から3号車は自由席です。」
ご参考に。