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Indian Railway's first implementation of Block Proving with Digital Technology.

First application on
Indian Railways
for (Double Line) Block Proving with Digital Axle Counter Utilizing
AzLS (Thales)
UFSBI- (Deltron)
& Block Panel
(As per RDSO/SPN/188/2004)

Highlights

Date of Commissioning:	1st September 2005.
Installation Site:	Double Line Section between Chakradharpur and Lotapahar, Chakradharpur Division, South Eastern Railway.
System:	AzLS: Thales Single Section Digital Axle Counter UFSBI: Deltron Universal Fail Safe Block Interface Block Panel: Deltron/Eldyne
Communication Medium:	Quad Cable for AzLS, Optical Fiber for UFSBI
Station Interlocking Type:	Chakradharpur- Mechanical Lever Frame Lotapahar- Electronic Interlocking.
Specification & Approval:	i) AzLS: RDSO/SPN/177/2003 & Cross Approval as per CENELEC SIL-4 by RDSO.
	ii) UFSBI 2/3 Failsafe Digital Multiplexer): RDSO/SPN/147/97 Approved by: RDSO Software validation as per CENELEC SIL-4 by Jadavpur University Hardware validation by IIT Delhi
	iii) Block Panel: RDSO/SPN/188/2004 System Validated & Approved by: RDSO

Brief Description of the System:

It is a non-co-operative, push button type Block Instrument capable of providing the last vehicle verification information in both single & double line sections. The Block Panel provided, offers easy-to-understand audio-visual indications for all vital information. The unique design of interlocking circuits and input/outputs through Q-series relays provide galvanic isolation, making the system usable in both RE & Non-RE sections.

The system is media versatile i.e. it can work on Copper cable, OFC or microwave without hampering the fail-safety of the operation. The schematic diagrams below show the working of the system in Double Line. System usable in both RE and Non-RE sections and designed to work with MACL, PI, RRI or SSI installations.

Block panel with SSDAC & UFSBI (Double Line)

System Specifications:

	The Relay logic & UFSBI is housed in a MS-Cabinet of dimensions 132 X 64 X 48 cm approx.
	The entire relay logic is implemented through Q-series signaling relays (viz. QN1, QNA1, QL1 and Electronic Timer relays), which are RDSO approved.
	AzLS consist of Sk30H Rail Contact & E-Es Track side Electronics with one Analog & Digital Card only.
	The UFSBI consists of Input Cards (6 nos.), Output Card (2 nos.), CPU card (3 nos.) Control Card (1 no.), a separate Leased Line Modem and a DC-DC Converter based Power Supply unit (with Hot Stand-by facility).
	The system functions on 24V DC (+20%, -10%) and has an approximate 3 Amp (max.) current consumption.
	AzLS placed at Advance Starter Signal (with Signal Overlap) & Home Signal (with block over lap).
	The USFBI two units of the system are placed at 2 stations & Panel with the Station Master
	AzLS communicates at 1200 baud & USFBI communicates at 2400

The Sub Components:


AzLS

BPUX05 – Mux Unit	Complete Cabinet

Principle of working:

	The trains are worked on Absolute Block system
	Each block section is provided with an Axle Counter to verify the occupation or clearance of block section and for Last Vehicle Verification
	Last Stop Signal cannot be taken ‘OFF’ unless LINE CLEAR has been obtained from the station in advance
	LINE CLEAR cannot be obtained unless block section and an adequate distance beyond first stop signal of station in rear is clear of trains
	The Last Stop Signal assumes ‘ON’ aspect automatically on entry of train into block section and when so replaced, is maintained in its ‘ON’ position, till a fresh LINE CLEAR is obtained on block panel
	Block section automatically shows Train on Line on panel when train enters into the block section on line clear reading the status of the axle counter
	Train entry/exit buzzer, to/ from block section are provided and to be acknowledged
	Block section automatically closes on complete arrival of train at the receiving station
	A control key is provided to prevent the station in rear to take LINE CLEAR on its Block Panel without taking consent of receiving station
	It is possible to close the block section only, if no trains have entered the Block Section for at least 120 seconds after application of cancellation with co-operation from station in rear

Acknowledgement:

	Shri N.K.Goel, Additional Member (Signal) Railway Board, for his vision & directive for the system.
	Shri G.D.Bhatia, Sr. Executive, RDSO for guidance and encouragement for development of the system.
	Shri G.G.Biswas, CSTE SE Railway, for his in-depth knowledge and assistance to implement the system.
	Shri N.N.Mukherjee, Deltron, for his exellent tean work for development of the USFBI.
	Shri S. Basu, Eldyne, for his support and vision to merge technology and emerge with solution for IR.
	Shri. J.Janle, Thales for understanding & delivering the right solution and ensuring the reliability.

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