1. This means that there is always a third rail or an overhead wire carrying an enormously high electric current.

2. You know this is the third rail right?

3. Third rail current collection comes in a variety of designs.

4. The third rail system uses a "shoe" to collect the current on the train.

5. The diagram above shows a top contact third rail system but there are other types as shown in this diagram.

6. But personnel benefits are a "third rail" issue in Congress - untouchable, she said.

7. Surreptitiously,(http:///third rail.html) I stuck boogers on the ends of my fingertips and then tossed them on to the third rail of the subway.

8. But such troubles is confined mainly to the railways on which the current is picked up from a third rail rather than from overhead conductors.

9. The higher requirements for traction power supply net are needed by the development of urban mass transit and the way of power supply by the third rail is widely used.

10. Google has even shown a willingness to join Facebook in gingerly tapping the third rail of Internet marketing—behavioral targeting.