Update on the doors from someone that knows what they are talking about, when I challenged them the same trains are in use on other GTR regions.
But simply they don’t do it well at Cambridge so everyone has to suffer. Hopefully as below they will open them again in the future. Be nice if they resolved the issue of course.
“Thank you for getting in touch with the customer relations team. Your email was passed to me and I’m pleased to respond below.
It was concerning to read through your email as you appear to have been given the wrong information. I don’t know where it was mentioned that having the doors on the 387s closed was a safety measure, but if this came from an official source, please let me know as this is not at all correct.
The doors at the end of the class-387 units have been locked, albeit temporarily, as this reduces coupling and decoupling times at key stations. Before we did this, and taking coupling at Cambridge as an example, we require three drivers to join two trains. Now we require only two and the process takes around half as much time as was previously the case. With many turnaround times at Cambridge rather tight, and also bearing in mind the other operators also requiring track space there, and the interaction of Cambridge trains with East Coast Mainline services when they join the mainline, any time that can be saved and prevent a train from running late was a priority.
At present this is a blanket policy to ensure consistency between services – we don’t want people to expect there to be a path between carriages when on some trains this won’t be the case. Going forwards this may change as more services from King’s Lynn will be formed of 8 carriages hence there will be less need to couple them at Cambridge and the doors can remain open.”