Book Of Tickets
Train Tickets, Train Coupons
noun
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.
かいすうけん
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.
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.