| 41. | A picnic table and walking track circuit starting from the picnic area passes through the tunnel.
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| 42. | Ireland recorded his first international victory on the first stop of the World Cup long-track circuit.
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| 43. | The failsafe track circuit remains in widespread use.
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| 44. | It is one of the last major oval track circuits to still compete on dirt tracks.
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| 45. | The signals and track circuits only activate when the TBTC system has failed, and are normally dark.
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| 46. | The locomotives had a wheelbase of only, and this was too short to operate the track circuits.
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| 47. | Rawson follows the track circuit around the world annually, not just becoming an expert every four years.
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| 48. | Miniature stop lights were to be introduced, and track circuits may also be introduced on the line.
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| 49. | Devers was favored for a fourth title because of her domination on the track circuit this summer.
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| 50. | But at every stop on the track circuit, Johnson also copes with being " the man to beat ."
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