(1) For the purpose of these rules, stations are classified into two categories i.e. block stations and non-block stations.
(2) Block stations are those at which the loco pilot must obtain an authority to proceed under the system of working to enter the block section with his train.
(3) Block stations provided with manually operated multiple aspects colour light signalling under the absolute block system of working consists of three classes,-
(a) class 'B' stations - where line clear may be given for a train even before the line has been cleared for the reception of the train within the station section;
(b) class 'C' stations .- where line clear may not be given for a train, unless the whole of the last preceding train has passed completely at least four hundred meters beyond home signals and is continuing its journey. An intermediate block post is a class 'C' station. There is no station yard at such stations; an
(c) ‘Special’ class stations are stations which do not fall under the category of class ‘B’ and ‘C’ above and are worked under special instructions.
(4) Block stations under the automatic block system of working are all called 'special' class stations.
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