名詞 rail:

1. a barrier consisting of a horizontal bar and supports
   同義詞：railing
2. short for railway
3. a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
   同義詞：track, rails
4. a horizontal bar (usually of wood)
5. any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud

動詞 rail:

1. complain bitterly
   同義詞：inveigh
2. enclose with rails
   同義詞：rail in
3. provide with rails
4. separate with a railing
   同義詞：rail off
5. convey (goods etc.) by rails
6. travel by rail or train
   同義詞：train
7. lay with rails
8. fish with a handline over the rails of a boat
9. spread negative information about
   同義詞：vilify, revile, vituperate
10. criticize severely
    同義詞：fulminate

1. If you are under 26 you can buy cheap rail tickets.
   未滿26歲者可購買廉價火車票。
2. The goods have been consigned (to you) by rail.
   貨物已交由鐵路發(fā)運(yùn)(給貴方).
3. It's cheaper to ship goods by road than by rail.
   公路運(yùn)輸比鐵路運(yùn)輸便宜。
4. A towel hung from the rail.
   欄桿上搭著條毛巾。
5. Our schedule went completely off the rails during the strike.
   我們的預(yù)定計畫在罷工期間完全被打亂了。
6. Passengers mustn't cross the rails.
   乘客不得橫過鐵路。
7. We installed a stainless steel towel rail on the wall.
   我們在墻上裝了一個不銹鋼的掛毛巾的橫桿。
8. We'll travel by rail.
   我們將坐火車旅行。

rail

n.（名詞）

A bar extending horizontally between supports, as in a fence.
橫桿：（籬笆上）水平置于兩個支撐柱之間的短棍
A structure made of such bars and supports and forming a barrier or guard; a railing.
圍欄：用這種短棍和支撐柱構(gòu)造架子，形成一個障礙或防護(hù)；柵欄
A steel bar used, usually in pairs, as a track for railroad cars or other wheeled vehicles.
鐵軌，鋼軌：用作火車車廂或其它有輪車輛的軌道的鋼軌，通常成對使用
The railroad as a means of transportation:
鐵路：作為運(yùn)輸方式的鐵路運(yùn)輸：
例句：
goods transported by rail.
通過鐵路運(yùn)輸?shù)呢浳?/br>
A horizontal piece of wood in a door or in paneling.
橫擋：門上或窗格上水平的木板
v.tr.（及物動詞）
railed,rail.ing,rails
To supply or enclose with rails or a rail.
用欄桿圍：提供欄桿或把欄桿圍起來

來源：
Middle English raile
中古英語 raile
from Old French reille
源自 古法語 reille
from Latin rôgula [straight piece of wood, ruler] * see reg-
源自 拉丁語 rôgula [直的木條，格尺] *參見 reg-

rail
rail 2

n.（名詞）
Any of various marsh birds of the family Rallidae, characteristically having brownish plumage and short wings adapted only for short flights.
秧雞：一種秧雞科的生活在沼澤中的鳥，特點(diǎn)為羽毛呈棕色，翅膀短，只能短距離飛行

來源：
Middle English raile
中古英語 raile
from Old French raale
源自 古法語 raale
perhaps from Old French raler, racler [to scrape]
可能源自 古法語 raler, racler [擦]
from Old Provenôal rasclar * see raclette
源自 古普羅旺斯語 rasclar *參見 raclette

rail
rail 3

v.intr.（不及物動詞）
railed,rail.ing,rails
To express objections or criticisms in bitter, harsh, or abusive language.See Synonyms at scold
責(zé)罵，抱怨：用憤恨、粗俗、辱罵的語言表示反對或批評參見 scold

來源：
Middle English railen
中古英語 railen
from Old French railler [to tease, joke]
源自 古法語 railler [逗弄，玩笑]
from Old Provenôal ralhar [to chat, joke]
源自 古普羅旺斯語 ralhar [閑聊，玩笑]
from Vulgar Latin *ragul3re [to bray]
源自 俗拉丁語 *ragul3re [發(fā)出叫聲]
from Late Latin ragere
源自 后期拉丁語 ragere

【引伸】
rail.er
n.（名詞）