What is the purpose of a Clearance Card Form K?

The purpose of a Clearance Card Form K is to enable a train to pass block limit stations as though clear. This form is issued when the conditions are such that the track ahead is obstructed but control measures have been put in place to allow for safe passage. It effectively provides assurance that the train can move through those block limit stations without stopping, even if there are potentially limiting factors present. This helps to maintain fluidity in train operations while ensuring safety protocols are still observed.

In this context, it is crucial that trains have a mechanism like the Clearance Card Form K to manage situations where typical stop signals might not reflect the true operational conditions, allowing for safety and efficiency in the railway system.