I just realized most VTEC services dont run to KGX that day either, so my plans are kinda ruined now. (Was planning to do some trainspotting on the ECML) But they do run on the 14th march(or am i mistaken), you guessed right my next question is: What services out of KGX are formed of a 317 on the 14th march after 2 PM? Most of the stoppers to Peterborough and Cambridge?
As far as I can tell it's normal Saturday diagrams that day. Therefore, this should produce the following 317s:
0735, 0805, 0835, 1135, 1205, 1505, 1535, 1735, 1835, 1905, 2135, 2205, 2305. All of the above are booked 1x317, although not always guaranteed to be so. If you're lucky, you may see some out covering 365s, or if there are any football extras.
If you're wanting to see large numbers then you'd need a weekday, where normally 10 out of the 12 are in operation during the peaks. On a Saturday there are booked to be no more than 3 out at any one time, 4 in total. Weekdays also produce some faster running on certain services.