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The train driver 4 <thp,$D  0 N:Remains responsible for observing lineside signals & speed 4 <h p2 ,$D 0 S?restrictions, two additional controls are provided to intervene 4 <i` @ ,$D  0 - in high risk situations.H 4 0޽h ? ̙33l P8( `   8 8 6Tj ,$D  0 "TPWS: Overview 8 <j p@,$D 0 e5 A Train Stop Sensor (TSS), which immediately applies66 8 <k`p,$D  0 E1the brakes of a train passing a signal at danger. 8 <tkp ,$D 0 f6 An OverSpeed Sensor (OSS), which immediately applies 77 8 <k @ ,$D  0 C/ the brakes of a train going too fast towards : 8 <4l p ,$D  0 <(A SIGNAL AT DANGER; A SPEED RESTRICTION; 8 <l@ `,$D  0 ! 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The signal in rear now referred to as an outer signal, which is also fitted with a TSS as a minimum The need for an OSS on an outer signal is dependent on whether there is adequate Safe Overrun Distance to the conflict point of the inner signal.H L 0޽h ? ̙33  = 5 0$T ( 4 TB T 0Dp`p,$D  0B T 0D ` ,$D  0xz    T  P ,$D  0Z2 T s *33@  Z2 T s *@  Z2 T s *PP @  `B T 0D  `B  T 0D    T s *P ,$D  0  T s *P ,$D  0  T <`*,$D   0 3TSS  T 6D  P,$D 0 .Converging Routes ScenarioXB T 0D  XB T 0Dp @XB T 0D@ XB T 0D XB T 0Dp`pXB T 0D` T s * ,$D  0  T s * ,$D  0 !T s *,$D  0 "T s *,$D  0 #T <$@,$D   0 3OSS $T <% pO ,$D   0 3OSSH T 0޽h ? ̙33 @X7(  X X 6 ,$D 0 %Converging Routes8 X <d@ R ,$D 0  Where a TPWS fitted signal has converging routes in rear, just as with AWS consideration must be given for OSS on both routes. However since the requirement for an OSS is based upon an inadequate SOD which itself is derived from an attainable speed The requirement for an OSS on a converging route can be alleviated. 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