For my MOCs I've decided to go with 7-wide. It opens the door to more detailed models; plus it's a special challenge to build in odd-wide dimensions. The 7-wide trains are not so overwhelming with respect to the official LEGO sets as 8-wide can be. The problem with the official sets is not so much the width diference but rather the level of detail. For that, I can't really blame the designers. Pierre Normandin is a LEGO designer and a member of my LUG (QueLUG). Last year, he brought over a copy of his 3677: Red Cargo Train to our winter meeting. When I talked to him about it, what really struck me the most was that he had to "simplify" his design over and over again to meet LEGO's marketing requirements.
However, for my FP-7 project, I decided to stick with 6-wide because I want to mix in my heavily-modified Metroliner cars. In the early days of VIA Rail, when CP and CN were transfering their passenger stock to VIA, there was often a mish-mash of liveries thrown together in a consist.
Edited by Dan-147, 30 January 2012 - 01:40 AM.