Spoiler Overground, Crossrail and Thameslink, respectively, and a one or two-digit number. The first number is the ‘main’ number and the second one, which is always a 5, is used for branch or ‘sister’ services. A similar system is used in Berlin, see for example the S7 from Potsdam to Ahrensfelde, and the S75 from Ostkreuz to Wartenberg. Of course, one could also introduce other numbers.



For example, on the East London Line of the Overground, you would have services O1 and O2 and their branches O15 and O25 (O15 is considered part of the O1, because it also starts/terminates at Dalston Junction). The Overground shuttle from Romford to Upminster does not carry a number, because one can hardly confuse it with any other Overground service. If one wanted, one could also call it O8.

On Crossrail, as an example, the C1, which runs more often, goes to Heathrow Terminal 4, while the less often running O15 goes to Terminal 5.

On Wikipedia, the Thameslink were even further divided, which is reflected in that T1 to T4 are the ‘mainline’ services and T6 to T9 the ‘metro’ services. I left the T5 out intentionally, so that a new Thameslink service in the future can fit in this system as either ‘mainline’ or ‘metro’.

O1 Dalston Junction – Clapham Junction



Dalston Junction – Clapham Junction O15 Dalston Junction – New Cross



Dalston Junction – New Cross O2 Highbury & Islington – West Croydon



Highbury & Islington – West Croydon O25 Highbury & Islington – Crystal Palace



Highbury & Islington – Crystal Palace O3 Clapham Junction – Stratford



Clapham Junction – Stratford O35 Clapham Junction – Willesden Junction



Clapham Junction – Willesden Junction O4 Richmond – Stratford



Richmond – Stratford O45 Gospel Oak – Barking



Gospel Oak – Barking O5 Euston – Watford Junction



Euston – Watford Junction O6 Liverpool Street – Enfield Town



Liverpool Street – Enfield Town O65 Liverpool Street – Cheshunt



Liverpool Street – Cheshunt O7 Liverpool Street – Chingford



Liverpool Street – Chingford O Romford – Upminster



Romford – Upminster C1 Heathrow Terminal 4 – Abbey Wood



Heathrow Terminal 4 – Abbey Wood C15 Heathrow Terminal 5 – Abbey Wood



Heathrow Terminal 5 – Abbey Wood C2 Reading – Abbey Wood



Reading – Abbey Wood C25 Maidenhead – Abbey Wood



Maidenhead – Abbey Wood C3 Paddington – Shenfield



Paddington – Shenfield C35 (Liverpool Street – Gidea Park)

(Liverpool Street – Gidea Park) T1 Bedford – Brighton



Bedford – Brighton T15 Bedford – Gatwick Airport



Bedford – Gatwick Airport T2 Peterborough – Horsham



Peterborough – Horsham T3 (Bedford – Littlehampton)



(Bedford – Littlehampton) T35 (Bedford – East Grinstead)



(Bedford – East Grinstead) T4 Cambridge – Bedford



Cambridge – Bedford T45 Cambridge – Maidstone East (– Ashford International)

Cambridge – Maidstone East (– Ashford International) T5 (left out)



T6 Luton – Rainham



Luton – Rainham T7 Sutton Loop – St Albans City



Sutton Loop – St Albans City T8 (Luton –) Kentish Town – Orpington



(Luton –) Kentish Town – Orpington T9 (Welwyn Garden City –) Blackfriars – Sevenoaks The line numbers include a letter, standing forverground,rossrail andhameslink, respectively, and a one or two-digit number. The first number is the ‘main’ number and the second one, which is always a 5, is used for branch or ‘sister’ services. A similar system is used in Berlin, see for example the S7 from Potsdam to Ahrensfelde, and the S75 from Ostkreuz to Wartenberg. Of course, one could also introduce other numbers.For example, on the East London Line of the Overground, you would have services O1 and O2 and their branches O15 and O25 (O15 is considered part of the O1, because it also starts/terminates at Dalston Junction). The Overground shuttle from Romford to Upminster does not carry a number, because one can hardly confuse it with any other Overground service. If one wanted, one could also call it O8.On Crossrail, as an example, the C1, which runs more often, goes to Heathrow Terminal 4, while the less often running O15 goes to Terminal 5.On Wikipedia, the Thameslink were even further divided, which is reflected in that T1 to T4 are the ‘mainline’ services and T6 to T9 the ‘metro’ services. I left the T5 out intentionally, so that a new Thameslink service in the future can fit in this system as either ‘mainline’ or ‘metro’.

Not sure if this is the right forum for my topic, moderators do feel free to move this thread.On Christmas Eve I created a diagram covering all Overground, Crossrail and Thameslink routes as of December 2019, in a style loosely based on Berlin’s S-Bahn and U-Bahn map I know, there are far more routes that have an ‘S-Bahn’ style service (I’m thinking of Maxwell J Roberts’ map of South London lines ), but I chose to focus on these three, as they are not too many routes and they make a nice representation with a circle and two orthogonal axis, similar to Berlin’s Ringbahn (S41-42-45-46-47), Stadtbahn (S3-5-7-9) and Nord-Süd-Bahn (S1-2-25) lines. Initially I also used the Berlin map’s font, but it is copyrighted so I had to replace it by Signika.I used all the information I could find online and also gave line numbers to the distinct services, which is uncommon in Britain (except for bus and tram routes), but very common in Germany:I would gladly hear your opinion on this. Do you think (a more professionally created version of) this map could be used in real life (including the line numbers)? Would you plan your journey with this map? Also feel free to point out any mistakes (like typos or incorrect routings).Before anyone asks; I tried to squeeze in the Underground and other National Rail services, but that was no good and would have turned out very confusing. This is though, why there are so many National Rail and Underground logos, as the ‘S-Bahn’ systems obviously have many interchange stations with them.Thanks for any comment, greetings from Germany and merry Christmas-- Simon (U-Bahnfreund)P.S.: In an earlier version of the map, the route of the river Thames was incorrectly shown; I have now updated this now, but it might take a while until the most recent version of the graphic appears.