A lot of the etiquette guidelines for riding trains in Japan are pretty well-known. The most famous is that the specially marked seats at the corner of the carriages are priority seats for elderly, disabled, or pregnant passengers.
Japan Today
HINTS
S (A lot of the etiquette) guidelines 多くの エチケット ガイドライン
[for] riding trains 電車に乗るための
(V riding )
(O trains )
[in] Japan 日本で
V [are]
(pretty) well-known. 非常によく知られている
S The most famous もっとも有名
V [is]
O [that]
S the specially marked seats 特別に作られた席
どんな→[at] the corner [of] the carriages 乗り物
V [are]
O priority seats 優先席
どんな→[for] (elderly, disabled, [or] pregnant) passengers. (年配、不自由な人 もしくは 妊婦) 乗客のため