A shop (often a restaurant) so popular that customers form long lines; colloquial term.
休日はあのラーメン屋が行列店になって、1時間以上待つこともある。
On holidays that ramen shop becomes a long-line place; sometimes you have to wait over an hour.
SNSで話題になっている行列店に並んでみたが、味は想像より普通だった。
I tried lining up at a trending long-line restaurant from social media, but the taste was more ordinary than I expected.
小さい店なのに行列店になったのは、口コミの力だろう。
The reason a small shop became a long-line place is probably the power of word-of-mouth.