Isolation

Means an arrangement, secured by the setting of points or other approved means, to protect the line so isolated from the danger of obstruction from other connected line or lines. (G.R. 1.02(32))

Isolation (G.R. 1.02(32), S.R. 3.50)

Isolation means an arrangement secured by the setting of points or other approved means to protect the line so it is isolated from the danger of obstruction from other connected line or lines.

By providing isolation, chances of side collision can be averted.Isolation is not required when the speed of run-through trains doesn't exceed 50 kmph.

The following are the effective means of Isolation:

  • Derailing switch:-When it is open, any vehicle passing over it derails without fouling the other lines.

  • Scotch block:-It is a metal or wooden piece placed on a rail ahead of points and locked to prevent movement of any vehicle.

  • Haye's Derail:-When it is on a rail, any vehicle passing over it derails.

  • Dead end / Buffer stop:-It is an extended siding into a dead end or buffer stop. It traps escaped vehicles.

  • Sand hump:-It is a short siding of an approved design ending in a sanded hump and a sharp rising gradient. It traps the escaped vehicles.

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