In article , Tom
Anderson writes
Okay. Assuming that the run in service back down is also 46 minutes,
and assuming zero turnaround time at either end, then the length of a
half-ECS cycle (is this what they call a diagram?)

No, a diagram is the complete set of workings of a train. So, using an
old WTT that I have to hand, a typical diagram is:

5B99 03:53 Hornsey EMD - KX (ECS, divides to form 2B99 and 2B00)
2B00 05:26 KX - Hertford North
2J01 06:35 Hertford North - Moorgate
3V91 07:30 Moorgate - WGC (ECS)
2K91 08:18 WGC - Moorgate
2B03 09:12 Moorgate - Hertford North
2J05 10:33 Hertford North - Moorgate
2B08 11:32 Moorgate - Hertford North
2J09 12:33 Hertford North - Moorgate
2B12 13:32 Moorgate - Hertford North
2J13 14:33 Hertford North - Moorgate
2B16 15:32 Moorgate - Hertford North
3K54 16:34 Hertford North - Moorgate (ECS)
2V30 17:25 Moorgate - WGC
3R24 18:18 WGC - KX (ECS)
2R24 18:53 KX - Letchworth via WGC
5R24 19:49 Letchworth - Letchworth Carriage Sidings

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