I think that whatever I use, it would be in my best interest to keep the track uniform. I have read other inquiries about different kinds of track being typical in real real railroads, but since there can be such a compatiblity conflict between these two very different and distinct rail/tie combinations, I will keep the switch and mainline track the same. I haven't really decided officially yet but since I will be using flex track I can custom make my curves and straightway with confidence that it can work. I must say though, although the atlas code 55 looks better and is much more affordable, the peco 55 is more rigid, and the switches stay open and closed like no other. I would feel much more confident about the atlas if I could find a way to ensure that as the switches are moved from one position to the other, that they stay with a good connection. The last thing I want is for my track to short and my trains to derail. I have looked into caboose industries' ground throws. They look cool, but they are so big for N-scale and you have to have some generous room in order to place them near the switch. In most layouts that are 4 X 8 space is not easily compromised. Any suggestions?