Great Western Coffee Shop

Hello,
I'm trying to figure out the diagrams for DMUs out of Penzance on sundays, however I am stick on the following trains:

2E68 13:42 Penzance - Exeter St Davids    
2C56 14:40 Penzance - Bristol Temple Meads
What services form these two?

Also I have noticed today that the 2E95 19:00 Penzance - Exeter St Davids is formed from a 150 and 153, but can't work out where the 153 came from?

Thanks.

Have you tried looking here http://www.realtimetrains.co.uk/search/advanced?location=Penzance&date=28%2F4%2F2013&tocs=All&timespan=3&show_schedules=11&schedule_type=0&show_wtt=1&show_var=1&show_stp=1

I was in the process of suggesting that S&T - and it may yet provide the answer - but it has some anomolies.  Given that you would expect the empty stock 5A90 to form 1A90 - the former arrives in platform 2 but the latter departs from platform 3.

...agreed.  There seem to be quite a few errors (not just at Penzance) in the data but to quote the old saying 'C**p in C**p out'  ;D ;D ;D

I come from the polite society which said garbage in, garbage out - but then I hate americanisms... ;D

I have been using Realtimetrains to try and work them out, but most of the time platform numbers for Penzance are incorrect to ones actually used. Looking on the Penzance webcam recently most HSTs have been using Platform 4.