Private Railway
noun
A private iron (remember how 鉄 often has to do with railroad tracks and the like? Same goes here) is a private railway. There are a good number of these in Japan.
してつ
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.
東京の私鉄はふくざつでよく分かりません。
Private railways in Tokyo are too complicated to understand.
JRで新宿駅まで行ったら私鉄に乗りかえてください。
When you arrive at Shinjuku Station by JR, please transfer to a private railway.
私は、とある日本の大手私鉄会社で働いております。
I work for one of the major private railway companies in Japan.