They reduced my connection to an uncomfortable level in EWR. I think I used Twitter to get them to change. They first tried to tell me it was a fee, but I had to REMIND them that it was due to a change in schedule made by them. Once I reminded them, they sent me a message on Twitter telling me they could make the change at no cost.

The next flight was the same situation in ORD. But, this time I used the messaging function on 'Contact United' on the website and was able to get the change made.

Its helps to remind them that it is a change they made, and have the new flights you want handy. You shouldn't have to take the train at your cost. This was a United change, and they should allow you to make the change for free.