Train Tickets, Train Coupons
Noun
かいすうけん
電車の回数券は金券ショップでも買えますよ。
You can also buy a book of train tickets from a ticket outlet.
Many times is how many times you can use this number of tickets. That means there are many tickets, making this a book of tickets.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.