Automatic block system, T/A912,T/B912,T/C912, T/D912,T/E912, amendment slip 18,Old Rule vs New rule

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Automatic Block system, automatic authorities, T/A912,T/B912,T/C912,T/D912,T/E912
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#automaticblocksystem​​
#authorities​​
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#T​​/A912
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#passautomaticsignalaton​​
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#amendmentslip
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