What makes the Asakusa line so profitable?

Hi guys, train nerd here. I saw the below financial info of Toei Subway:

FY2023 Toei Subway Line Revenue and Ridership

Line Revenue (¥ million) Expenditure (¥ million) Profit/Loss (¥ million) Passengers per Day Profit Margin (%)
Asakusa 32,777 24,111 8,666 683,003 26.44%
Mita 33,256 26,954 6,302 606,811 18.95%
Shinjuku 37,770 31,521 6,249 704,235 16.54%
Ōedo 53,294 56,498 -3,203 836,179 -6.01%

Just out of curiosity, what makes the Asakusa line so profitable? This is despite having the lowest revenue and fewer passengers than other lines. From the numbers, it looks like the Asakusa line has much lower operational costs, but why?

Source: https://www.kotsu.metro.tokyo.jp/about/information/closing/pdf/r05_closing04.pdf

Edit 1: added profit margins

Edit 2: Just took another look at the numbers and damn, a 26% profit margin? That's huge, especially for a railway line. Most systems around the world run at a loss.

by pierperrier

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