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SimSig Drain
Sim Versions
Legal Stuff
Line Summary
Train Service
Timetable Locations
Known Problems
Signalling Diagrams

SimSig Drain


Sim Versions

Version Status Scroll/Views Published Comments
V1.1 Donationware V 26/11/11 No longer available to download


Title Published Author Comments
Weekday 05/02/07 TBC Bundled with V1.1
Drain with additional trains 26/07/10 Ipswich Available from Download section


SimSig Drain is a simulation of the Waterloo & City Line of the London Underground, colloquially known as the "Drain".

SimSig is for personal entertainment use only and must not be used for any commercial use, including the training of signallers etc. Those who are interesting in the commercial application of this software should look at

SimSig is protected by copyright. No SimSig file may be distribution by any other website, by CD ROM or other media without express written permission from G. Mayo. The only exception is when SimSig files are transferred between private individuals where no charge, fee or profit levied.

This software and is offered as-is, "what-you-see-is-what-you-get". Errors, omissions, faults or other problems are not covered by any warranty of any kind. Problem reports may be emailed or posted on the forums but action may or may not be taken by the authors, a decision which is up to said authors. SimSig accept no responsibility for any damage that may be caused to computer systems by the software.


SimSig Drain attempts to match the real experience as far as possible, but I was limited by the available information. Signal and points numbering is taken from diagrams published in Underground News. Track circuits have been guessed based on my (incomplete) knowledge of general practice.

Line Summary

The Waterloo & City Line has only two stations: Bank and Waterloo, with unidirectional tunnels between them. South-west of Waterloo there is a 5-track depot. There is no way for trains to enter or leave the line other than with the aid of a crane.

The speed limit on the running lines is 40mph. The line is electrified on the LU 4-rail system.

The H or T shapes at various points on the simulation are "policemen" - train stops not associated with a signal. These lower after a predetermined time chosen not to affect a train being driven normally, but will trip a train travelling too fast; an arrangement called "Moorgate Control".

At Waterloo, trains normally reverse in depot road 5, and this is the only one that ARS can set routes for.


The scenarios are self-evident.

Train Service

The supplied timetable is imaginary but based on current train frequencies. A standard train consists of two two-car units; each unit is 35m long. There is room for a full train in each platform and siding.


London Underground normally assigns a single number to a train for the entire day. However, SimSig is not able to cope with this and so a different arrangement has been used.

The leading digit shows the train status: 2 for trains in passenger service and 5 for ECS moves. The letter then identifies the train in LU terms: A for train 201, B for train 202, C for train 203, D for train 204, E for train 205, and W for the half-train moving to and from the washer. Finally, the last two digits give the run number, starting at 01 (except for train 205, which starts at 00); this normally changes in Waterloo platform 25. The timetable runs from 06:00 (with the first real move at 06:13½) to 23:00 (but the last train is scheduled to stable at 21:54½).


The following "simplifier" describes the service.

A Headcodes

5A01 stays in depot road 2 until 14:00½, then moves to Waterloo where it divides into 5A02 (Bank end) and 5W01 (depot end).

5A02 runs into depot road 2 as soon as possible and stays until 14:15½, when it returns and becomes 5A03.

5A03 runs across to the washer road as soon as possible, is washed, and stays there until 5W03 has moved to platform 25. It then comes out to join on to it (note that this reverses the two halves) and become 5A04.

5A02 runs into depot road 2 as soon as possible and stays until 20:01, when it returns and becomes 5A05.

5A05 runs into depot road 6 as soon as possible and terminates.

B Headcodes

5B01 starts in the reversing road (depot road 5) and is the first train into service, at 06:13½. It stays in service all day, finishing as 2B67 in Bank platform 7.

C Headcodes

This train starts in depot road 6 and runs only in the peak hours.

5C01 comes into service at 07:31.

As 2C11 it arrives at Waterloo at 09:30, becomes 5C11, and runs back into depot road 6, where it stays until 16:08.

As 2C25 it arrives at Waterloo at 19:05, runs into depot road 7 (the washer road), and terminates.

D Headcodes

This train starts in depot road 7.

5C01 comes into service at 07:34. The train then runs for the rest of the day, finishing as 2D62, which arrives at Waterloo at 21:52 and then terminates in depot road 5.

E Headcodes

This train starts at Bank platform 7. It is 5E00 while entering the simulation, but then immediately becomes 2E01. It runs in the early morning and the two peaks.

As 2E15 it arrives at Waterloo at 09:36 and runs forward to depot road 5, where it becomes 5E15. It then shunts via platform 25 to depot road 3, where it becomes 5E16.

5E16 comes into service at 16:34, runs forward into platform 25, and becomes 2E16.

As 2E25 it arrives at Waterloo at 18:33 and becomes 5E25. It then shunts via road 5 and platform 25 to depot road 3, and becomes 5E26.

5E26 waits until 20:16, then shunts via platform 25 to depot road 2, where it terminates.

W Headcodes

5W01 is formed from the south-west half of 5A01 at 14:01, runs across to the washer road as soon as possible, is washed, and stays there until 14:15½, when it moves into platform 26 (the arrival platform) and becomes 5W02.

5W02 waits for 5A03 to cross to the washer and then shunts to platform 26 via depot road 5 (this can be done by ARS), where it becomes 5W03.

5W03 runs into depot road 2 as soon as possible and stays until 14:30½, when it returns to platform 25 to wait for 5A03 to join it.

Note how the five trains end up in different places, so each will run each of the five schedules in a week; furthermore, the two halves of each will be swapped (meaning each driving cab gets used alternately for a week at a time).

Timetable Locations

This section lists the internal codes for the timetable locations in the simulation. These codes are used when using the timetable converter. When a train enters the simulation a different code - an entry point code - is used.


Known Problems

Location Codes Entry point codes
Waterloo WAT

The following problems are known about in this beta release.


This section will be updated as bugs are reported.

Signalling Diagrams

These are Adobe Acrobat PDF files. If you don't have Adobe Acrobat Reader installed on your computer you can get a free download of the latest version from the Adobe website . Use the built-in Find function (Ctrl+F) to locate signal numbers.

Last edited by Steamer on 27/06/2020 at 11:40