PRIVATE: NOT FOR PUBLICATION

TRAFFIC CIRCULAR SUPPLEMENTNo. 4 (1987)

METROPOLITAN LINEBAKER STREET

REVISED SIGNALLING ARRANGEMENTS

Operative frorn

Sunday,26th July, 1987

Subject

General

Track and Signalling

Baker Street Signal Box

Signal Power Supply Circuit Breakers

Communications

A_GENERAL

A1-With effect from 07.30 hours on Sunday, 26th July, new signalling will be commissioned in the Baker Street and Lords area, and a new interlocking

machine room designated'MB'will be brought into use at Baker Street (Metropolitan Line).

A2-All movements in the area will be controlled for the time being from a new key-operated panel located in Balier Street (Met.) signal box. Eventually

this local control will be transferred to Baker Street Signalling Control Centre.

B_TRACK AND SIGNALLING

B1-All signal and point numbers in the area will be changed. Full details of the new arrangements are shown on the diagrams included in this

Supplement. N.B. These diagrams show the final arrangement but, after commissioning, certain temporary speed restrictions will be in force pending

completion of the Permanent Way work.

B2-The track layout will be revised so that the route from the southbound main line into Baker Street platform l, currently via the scissors crossover

and double slip, will now be via a new crossover further north ofthe station.

B3-Signal MBI/4A will clear if the speed of an approaching train is controlled in accordance with the 25 m.p.h. permanent speed restriction sign.

B4-Signal MB4B will clear for route I if the speed of an approaching train is controlled in accordance with the 25 m.p.h. permanent speed restriction

sign. Signal MB4B is approach lit and is extinguished until signal MBL/4A has cleared for a route with No. 7 points normal.

Bs-Signal MB5 will clear if the speed of an approaching train is controlled in accordance with the 25 m.p.h. permanent speed restriction sign. Signal

MB5 is approach lit and is extinguished until signal MB4B has cleared for the route to platform 3.

B6-Operation of Draw-Up Signals

(a) Signal MBl00 will clear by the operation oflever No.l, or by the operation ofdelta track 887" for 4[ seconds.

(b) Signal MB140 will clear (i) with signal MBl4 clear, or (ii) by the occupation of track circuit WN for 4[ seconds, or (iii) by the occupation of track

circuitsWH,WM,orWN,providedthatclearanceofsignalMBl40doesnotconflictwithclearanceofsignalMBlT. Providedthereisnosuchconflict,

Nos. 30 and 32 points will, if not already normal, be normalised automatically and will be locked for approximately 15 seconds.

(c) Signal MB 160 will clear by the operation of lever No. 16, or by the occupation of track circuit 143" for 4[ seconds, or by the occupation of track

circuit l43B for 4[ seconds.

(d) Signal MrBl6/l'10 will clear by the operation oflever No. 16, or by the operation ofdelta track 143'for 4[ seconds.

(e) Signal MBl6/l7l will clear by the operation of lever No. 16, or with signal MB 17 clear, or by the operation of delta track 145o for 4[ seconds.

(/) Signal MB260 will clear (i) with signal MB26 clear, or (ii) by the operation ofdelta track UQ for 4[ seconds before the train traverses blockjoint

UQ/UT, or (iii) by the occupation of track circuit UT for 4[ seconds.

(g) Signal MB35./340 will clear (i) by the operation of lever No. 35, or (ii) by the operation of delta track UA for 4[ seconds, or (iii) with No. 31 points

normal and platform 6 occupied, by the occupation oftrack circuit 188'for 4[ seconds.

2

87.- Operation of Signal MB34 (route 2) and Signal 4900

(a) Signal MB34 (route 2) will clear when the preceding train is clear of blockjoint U'I/UU.

(b) Signal A900 will clear when the same preceding train is clear of blockjoint UU,/UX, but the trainstop at this signal witl NOT lower unless the speed ofthe next approaching train is controlled in accordance with the 15 m.p.h. permanent speed restriction sign.

B8-Southbound Trains Entering Platforms 1,2 and 4

These three platforms have two speed-controlled trainstops and associated timing sections installed. These trainstops will lower if the speed of an

approaching train is controlled in accordance with the l5 m.p.h. and 10 m.p.h. permanent speed restriction signs.

B9-Reversing of Long Trains

(a) It is not possible to reverse long trains in platforms 1 ,2, 3 or 4. Reversal of long trains between southbound and northbound Metropolitan Linesmust be done via route 33(2).

(b) If a train exceeding 1 15 metres in length is required to reverse in platform 6, signal MB28 must be cleared to allow the train to draw forward in orderto reverse at signal MBl8. (It will not be backtripped at signal MB28).

(c) Reversal of long trains from the Outer Rail to the northbound Metropolitan Line may only be done via platform 2.

(/)Ifatrainexceedingl33metresinlengthisrequiredtoreverseatsignalMB33,thetrainmustfirstdrawpastsignalAl83. (Itwillnotbebacktrippedatsignal A183).

B10-All trains must draw well up to signals at Danger to ensure the prompt operation of any route releasing or speed control arrangement. Where a

delta track (rail circuit) is provided, its position is indicated by a metal triangle fixed to the sleeper.

Bll-Traction Cunent Arrangements

Existing traction cuffent sections in the Baker Street area will remain unchanged.

B12-Current Rail Gap Indicators

Current rail gap indicators will be provided at the following signals and will be illuminated when traction current is switched off from the sections

indicated below, provided that the section switches are in their normal positions.

SIGNAL POSITION OF POINTS CURRENT SWITCHED OFF FROM

CURRENT RAIL SECTION

MB48

MB4B

MBI4

MBI5

MB17

MBI8

MB24

MB25

MB33

MB33

MB33

MB34

MB34

8 Reverse

I I Reverse

3l Normal and 32 Reverse

3l Reverse and 32 Reverse

32 Normal

3l Normal

3l Reverse

Baker Street to Finchley RoadNorthbound Metropolitan

Baker Street to Finchley RoadNorthbound Metropolitan

Baker Street to Chalton Street Outer

Rail

Baker Street to Chalton Street Outer

Rail or Chalton Street to Baker Street

Inner Rail

Baker Street to Chalton Street Outer

Rail

Baker Street to Chalton Street Outer

Rail or Chalton Street to Baker Street

Inner Rail

Baker Street to Finchley RoadNorthbound Metropolitan

Baker Street to Finchley RoadNorthbound Metropolitan

Chalton Street to Baker Street Inner

Rail or Baker Street to Bouverie Place

Inner Rail

Chalton Street to Baker Street Inner

Rail or Baker Street to Finchlev Road

Northbound Metropolitan

Finchley Road to Baker StreetSouthbound Metropolitan

Baker Street to Bouverie Place Inner

Rail

Baker Street to Finchley RoadNorthbound Metropolitan

J

C_BAKER STREET SIGNAL BOX

Cl-The existing illuminated diagram will be replaced by a new diagram showing the altered signalling and track layout.

C2-The power frame levers will be taken out of commission. The new interlocking machine will be controlled from a key panel installed in the signalbox power frame. Keys provided for route-setting are of the non-locking, spring-loaded, centre-off type. To select a route, the key must be depressed

and held until the associated visual is illuminated. The route will be cancelled when the train accepts the route or when it is manually cancelled by the

Signalman lifting the key.

C3-Two keys of the single-throw locking type areprovided to introduce "Full Auto" or "Auto with Starting Signals Held" working on the Circle Line.In the latter mode, signals MB17 and MB28 are selected by using the appropriate route-setting keys. Returning from "Full Auto" or "Auto withStarting Signals Held" modes to normal mode does not cancel individual routes. Ifrequired, these may be cancelled by lifting the relevant route-setting

key.

C4-Route-Setting Keys

KEY DESCRIPTION

l(l) Southbound Junction Signal to Platform 4

l(2).4(1).5 Southbound Junction Signals to Platform 3l(3).4(2) Southbound Junction Signals to Platform 2

1(4).4(3) Southbound Junction Signals to Platform 1

14 Southbound Starting Signal from Platform 315 Southbound Starting Signal from Platform 2

16* Outer Rail Inner Home Signal

17 Outer Rail Starting Signal

18 Inner Rail Starting Signal to Outer Rail

24 Platform 4 Starting Signal to Northbound Line

25 Platform 3 Starting Signal to Northbound Line

26 Platform 2 Starting Signal to Northbound Line

2'7 Platform I Starting Signal to Northbound Line

28 Inner Rail Starting Signal to Edgware Road

33(1) Outer Rail Shunt to Inner Rail

33(2) Outer Rail Shunt to Platform 233(3) Outer Rail Shunt to Platform 3

34(1).35 Inner Rail Junction Signal to Platform 6 and Inner Junction Home Signal

34(2).35** Inner Rail Junction Signal to Platform 2 and Inner Junction Home Signal

36 Inner Rail Junction Home

OFF

FULL AUTO Circle Line full automatic working

OFF

AUTO WITH I

STARTING SIGNALS I Cir"t" Line automatic working with starting signals heldI

HELD )

* - This route is selected automatically if other train movements will not thereby be delayed++ - To allow a train to draw up to signal MB34 as quickly as possible, key 34(2).35 should be operated even though the route may not be immediately

available.

CS-Emergency Release Facility

(a) An emergency release will operate only on the approach lock of signal levers. The exception is signal MB5, which has no release.

(6) To take an emergency release the Signalman must lift the appropriate route key long enough to replace the signal to Danger.

(c) The release will then commence automatically and after one minute the Signalman will be able to obtain another route. There is no approach lock on

the lever of signal MB28.

D_SIGNAL POWER SUPPLY CIRCUIT BREAKERS

A f'acility has been provided for the remote resetting of the circuit breakers in the interlocking machine room. This takes the form of a locked box

located in Baker Street signal box. The locked box contains a push-button and two visuals "C.B. No. 1 CLOSED" and "C.B. No. 2 CLOSED". For the

remote resetting ofthe circuit breakers, the push-button must be pressed and held until the visuals are illuminated. The key to the locked box is retained

in Baker Street signal box.

E_COMMUNICATIONS

El-The whistle push-button on the signal box power frame will be retained.

E2-The existing train description facilities in the signal box will be retained.

E3-Telephones will be installed at signals as indicated on the diagrams included in this Supplement and will connect with Baker Street signal box.

E4-Automatic telephone No. 21072 will be installed in Baker Street (Met.) interlocking machine room.

55 Broadway, London SWlH OBD

25th June, 1987

100/BHA/14/07 /302

W.R. Clarke

Operations Director

London Underground Ltd.

I 700

STANDARD SYMBOLS

DESCRIPTION SYMBOL

TWO ASPECT (GREEN-RED) COLOUR LIGHT SIGNAL. SEMI-AUTOI4ATIC

TWO ASPECT (GREEN-RED) COLOUR LIGHT SIGNAL. AUTOMATIC

SEMI-AIITOMATIC SIGNAL WITH JUNCTION INDICATOR

APPROACH LIT SIGNAL

THREE ASPECT (GREEN-YELLOW-RED) COLOUR LIGHT SIGNAL. SEMI-AUTOMATIC

TWO ASPECT (GREEN*YELLOIiI) COLOUR LIGHT SIGNAL

REPEATER OF SEMT-AUTOMATIC SIGNAL

TWO ASPECT (GREEN-YELLOW) COLOUR LIGHT SIGNAL

REPEATER OF AUTOMATIC SIGNAL

TWO ASPECT (GREEN-YELLOW) COLOUR LIGHT SIGNAL WITH SUPPRESSED LIGHTING

REPEATER JIJNCTION INDICATOR (FITTED ON TI,IO ASPECT REPEATER SIGNAL)

EXTERNALLY ILLUMINATED DISC. SHUNT SIGNAL

(SHOWN WITH ROUTE INDICATOR)

FIXED RED LIGHT r0CURRENT RAIL GAP ]NDICATOR PTRAINSTOP rlEXTERNALLY ILLUMINATED TUNNEL SPEED RESTRICTION SIGN

(SPEED IN M.P.H. ARROW, IF PRESENT, INDICATES ROUTE APPLICABLE)

EXTERNALI,Y ILLUMINATED OPEI'I SECTION SPEED RESTRICTION SIGN

(SPEED IN M.P.H. ARROW, IF PRESENT, INDICATES ROUTE APPLICABI,E)

DELTA TRACK (RAIL CIRCUIT) - USED FOR TRAFF-IC IN DIRECTION OF' b'LAG PDELTA TRACK (RAIL CIRCUIT) - USED F'OR TRAPFIC IN BOTH DIRECTIONS ?POINTS FITTED WITH FACING POINT LOCK & GROUND LOCK

POINTS FITTED WtrTH FACING POINT LOCK

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